🐾 Common Intoxications in Dogs & Cats
Comprehensive Veterinary Quick Reference — Symptoms, Timelines, Treatment Protocols, Monitoring & Prognosis
⚠️ Disclaimer: This is a reference summary compiled from standard veterinary toxicology resources. Always consult ASPCA Animal Poison Control (888-426-4435), Pet Poison Helpline (855-764-7661), or current references (Plumb’s, BSAVA Manual, Small Animal Toxicology) for the most up-to-date protocols. Drug doses should be verified before clinical use. Individual patient factors may require dose adjustments.
🍫
HIGH RISK
Chocolate (Theobromine / Caffeine)
DOGS & CATS Dogs most commonly affected
💊 Toxic Dose & Theobromine Content ▶
| Chocolate Type | Theobromine (mg/oz) |
|---|---|
| White chocolate | 0.25 |
| Milk chocolate | 44–58 |
| Semi-sweet / Dark | 130–450 |
| Baking chocolate (unsweetened) | 390–450 |
| Cocoa powder | 400–737 |
| Cocoa bean mulch | 56–900 |
| Clinical Effect | Theobromine Dose (mg/kg) |
|---|---|
| Mild GI signs | 20 mg/kg |
| Cardiac signs (tachycardia, arrhythmias) | 40–60 mg/kg |
| Seizures | >60 mg/kg |
| LD50 (dogs) | 100–200 mg/kg |
Cats rarely ingest chocolate voluntarily but are equally susceptible. Dark chocolate and baking chocolate are the most dangerous.
🕐 Clinical Signs & Timeline ▶
1–4 hours post-ingestion
Vomiting, diarrhea, polydipsia, restlessness, abdominal discomfort. Vomiting may contain chocolate.
4–12 hours
Hyperactivity, tachycardia, tachypnea, polyuria/polydipsia, hyperthermia, premature ventricular contractions (PVCs). Diuretic effect of methylxanthines.
12–36 hours
Severe cardiac arrhythmias (ventricular tachycardia, VF), muscle rigidity, tremors, seizures, cyanosis, coma, death. Theobromine half-life in dogs ≈17.5 hours — signs may persist 24–72 hrs.
Note: Theobromine undergoes enterohepatic recirculation → prolonged clinical signs. Half-life is ≈17.5 hrs in dogs.
🔬 Diagnostics ▶
| Test | Purpose / Expected Findings |
|---|---|
| ECG (continuous) | Sinus tachycardia, PVCs, ventricular tachycardia, atrial fibrillation |
| Serum chemistry | Hyperglycemia (stress), hyperkalemia (rhabdomyolysis), elevated CK |
| Blood gas | Metabolic acidosis in severe cases |
| Urinalysis | May see methylxanthine crystals; theobromine reabsorbed from bladder |
| Serum/urine theobromine | Available through specialty labs (not usually necessary for treatment decisions) |
💉 Treatment Protocol ▶
DECONTAMINATION (within 1–2 hours of ingestion)
| Drug / Intervention | Dose | Route | Notes |
|---|---|---|---|
| Apomorphine (Dogs) | 0.03 mg/kg IV or 0.04 mg/kg conjunctival | IV or ocular | Rinse conjunctival sac after emesis achieved. First choice in dogs. |
| 3% Hydrogen peroxide (Dogs only) | 1–2 mL/kg PO (max 45 mL) | PO | May repeat once if no emesis in 10–15 min. Do NOT use in cats. |
| Dexmedetomidine (Cats) | 7 mcg/kg IM | IM | Reverse with atipamezole after emesis. Preferred emetic in cats. |
| Activated charcoal | 1–2 g/kg PO | PO | First dose with sorbitol cathartic (1–2 mL/kg of 70% sorbitol). Repeat charcoal (WITHOUT sorbitol) at 1 g/kg q6–8h for 24–48h due to enterohepatic recirculation. |
⚠️ CRITICAL: Place a urinary catheter to prevent theobromine reabsorption from the urinary bladder. Theobromine is passively reabsorbed across the bladder mucosa.
SUPPORTIVE & SYMPTOMATIC THERAPY
| Drug / Intervention | Dose | Route / Frequency | Indication |
|---|---|---|---|
| IV fluids (LRS or 0.9% NaCl) | 2–3× maintenance | IV CRI | Enhance renal excretion, maintain hydration. Continue 24–72h. |
| Lidocaine (Dogs) | 2 mg/kg IV bolus, then 40–80 mcg/kg/min CRI | IV | Ventricular tachycardia / PVCs. Monitor ECG continuously during CRI. |
| Lidocaine (Cats — use cautiously) | 0.25–0.5 mg/kg IV slowly | IV | Only if life-threatening ventricular arrhythmia. Cats very sensitive — risk of seizures. |
| Atenolol | 0.25–1 mg/kg PO q12–24h | PO | Supraventricular tachycardia. Not first-line if hypotensive. |
| Diazepam | 0.5–1 mg/kg IV | IV PRN | Seizure control. Repeat q5–10 min × 3 max. If refractory → phenobarbital or propofol. |
| Phenobarbital | 2–4 mg/kg IV q6h | IV | Refractory seizures. |
| Methocarbamol | 55–220 mg/kg IV slowly (max 330 mg/kg/day) | IV | Severe muscle tremors. Give slowly — do not exceed 2 mL/min. |
| Maropitant | 1 mg/kg SC/IV q24h | SC or IV | Anti-emetic if persistent vomiting. |
📋 Monitoring ▶
| Parameter | Frequency | Target / Action |
|---|---|---|
| ECG | Continuous for 12–48h | Detect PVCs, VT, VF. Treat if R-on-T phenomenon or hemodynamic compromise. |
| Heart rate & blood pressure | q1–2h initially, then q4h | Treat sustained tachycardia >180 bpm (dogs). Watch for hypotension. |
| Temperature | q2–4h | Active cooling if >104°F (40°C). Stop at 103.5°F. |
| Neurological status | q2–4h | Assess mentation, tremor severity, seizure activity. |
| Urine output | q4h (via catheter) | Goal: 1–2 mL/kg/hr. Ensure catheter in place for theobromine drainage. |
| Electrolytes, BUN, Cr | q12–24h | Assess renal function, electrolyte imbalances. |
📊 Prognosis ▶
Good prognosis: Early decontamination with mild GI signs only; resolution in 12–24 hrs with appropriate care.
Guarded prognosis: Cardiac arrhythmias requiring intervention; baking chocolate/cocoa powder ingestion at >40 mg/kg theobromine.
🚨 Poor Prognostic Indicators
- Status epilepticus unresponsive to diazepam + phenobarbital
- Ventricular fibrillation or sustained ventricular tachycardia refractory to lidocaine
- DIC (disseminated intravascular coagulation)
- Cardiopulmonary arrest
- Ingestion >100 mg/kg theobromine with delayed presentation (>6h)
🍇
HIGH RISK
Grapes, Raisins, Currants & Sultanas
DOGSCATS Idiosyncratic AKI — tartaric acid suspected toxin
💊 Toxic Dose ▶
NO SAFE DOSE ESTABLISHED. Toxicity is idiosyncratic — some dogs develop AKI after a few grapes, others tolerate large quantities. Treat ALL ingestions as potentially toxic.
| Product | Reported Toxic Range |
|---|---|
| Grapes (fresh) | As low as 3 g/kg (some reports at 0.3 oz/kg) |
| Raisins | As low as 0.16 oz/kg (2.8 g/kg) |
| Currants / Sultanas | Similar or lower threshold than raisins (more concentrated) |
| Grape juice, wine, grape-seed extract | Case reports exist; treat as potentially toxic |
Tartaric acid hypothesis (2021): Tartaric acid and its salt (potassium bitartrate) have been proposed as the nephrotoxic agent, which may explain individual fruit and batch variability in toxicity.
🕐 Clinical Signs & Timeline ▶
0–6 hours
Vomiting (most common and often earliest sign — may contain grape/raisin material), diarrhea, lethargy, anorexia, abdominal pain.
6–24 hours
Continued vomiting, polydipsia initially transitioning to reduced water intake, dehydration, lethargy worsening.
24–48 hours
Acute kidney injury (AKI): Azotemia (rapidly rising BUN & creatinine), hyperphosphatemia, hypercalcemia. Oliguria develops → anuria. Abdominal pain (renal swelling).
48–72+ hours
Anuric renal failure, uremic vomiting, oral ulceration, severe electrolyte derangements (hyperkalemia), death if untreated.
🔬 Diagnostics ▶
| Test | Timing | Expected Findings |
|---|---|---|
| BUN, Creatinine | Baseline, then q12–24h × 72h | Rising azotemia 24–48h post-ingestion. Creatinine may lag behind clinical deterioration. |
| Phosphorus, Calcium | With chemistry panel | Hyperphosphatemia, hypercalcemia reported in many cases. |
| Electrolytes (K⁺, Na⁺) | q12–24h | Hyperkalemia with oliguric AKI — life-threatening. |
| Urinalysis with sediment | Baseline and q24h | Glucosuria (proximal tubular damage), proteinuria, granular casts, isosthenuria. |
| Urine output | Continuous (urinary catheter) | Goal >1 mL/kg/hr. Oliguria (<0.5 mL/kg/hr) or anuria = critical. |
| SDMA | If available | Early marker of renal function decline — may rise before creatinine. |
| Abdominal ultrasound | If AKI suspected | Renal enlargement, hyperechoic cortices, perirenal effusion. |
💉 Treatment Protocol ▶
DECONTAMINATION (within 2–4 hours, ideally <2h)
| Intervention | Dose | Notes |
|---|---|---|
| Emesis | Apomorphine (dogs) or Dexmedetomidine (cats) — standard doses | Induce ASAP. Raisins swell in stomach and may be recovered even hours later. |
| Activated charcoal | 1–2 g/kg PO with cathartic | May have limited binding capacity for grapes; still recommended as standard of care. Single dose. |
AGGRESSIVE IV FLUID THERAPY (cornerstone of treatment)
| Intervention | Dose / Rate | Duration | Notes |
|---|---|---|---|
| IV crystalloids (LRS or 0.9% NaCl) | Twice maintenance (approx. 4–6 mL/kg/hr) or higher based on hydration deficit | Minimum 48–72 hours | Start IMMEDIATELY, even in asymptomatic patients. Goal: support renal perfusion, promote diuresis. Adjust based on UOP, hydration, and cardiovascular status. |
| Maropitant | 1 mg/kg SC or IV q24h | As needed | Anti-emetic — essential to control vomiting and allow fluid therapy. |
| Ondansetron | 0.5–1 mg/kg IV q8–12h | As needed | Add if refractory vomiting despite maropitant. |
MANAGEMENT OF OLIGURIC / ANURIC AKI
| Intervention | Dose | Notes |
|---|---|---|
| Furosemide | 2–4 mg/kg IV bolus, then 1–5 mg/kg/hr CRI | Initiate if UOP <1 mL/kg/hr despite adequate fluid resuscitation. If no response to bolus + CRI within 4–6h → poor indicator. |
| Mannitol | 0.5–1 g/kg IV over 20 min | Osmotic diuretic; ONLY if still producing some urine. Contraindicated if anuric or overhydrated. |
| Dopamine (low-dose) | 1–3 mcg/kg/min CRI | Renal-dose dopamine — evidence is controversial. May improve renal blood flow. |
| Hemodialysis | Per facility protocol | GOLD STANDARD for anuric AKI. Refer early if available. Intermittent HD or CRRT. |
⚠️ Hyperkalemia management (if K⁺ >6.5 mEq/L or ECG changes): Regular insulin 0.5 U/kg IV + dextrose 2 g per unit insulin IV; calcium gluconate 10% at 0.5–1.5 mL/kg IV slowly over 10–15 min with ECG monitoring (cardioprotective, does not lower K⁺).
📋 Monitoring ▶
| Parameter | Frequency | Target / Action |
|---|---|---|
| BUN, Creatinine, Phosphorus | q12h first 48h, then q24h | Rising creatinine despite aggressive fluids = renal tubular damage occurring. |
| Urine output | Continuous (urinary catheter or intermittent weighing) | Goal: 1–2 mL/kg/hr. <0.5 mL/kg/hr = oliguric. 0 = anuric → escalate treatment. |
| Electrolytes (K⁺) | q8–12h | K⁺ >6.5 or ECG changes → immediate treatment (see above). |
| Hydration status | q4–6h | Skin turgor, mucous membranes, body weight (daily). Watch for fluid overload (serous nasal discharge, chemosis, tachypnea). |
| Blood pressure | q6–12h | Hypertension common with AKI; may need amlodipine 0.1–0.25 mg/kg PO q24h. |
📊 Prognosis ▶
Good prognosis: No azotemia develops within 72h of aggressive fluid therapy. Vomiting only, no renal changes.
Guarded prognosis: Mild azotemia that responds to fluid diuresis; still producing urine.
🚨 Poor Prognostic Indicators
- Anuria or oliguria unresponsive to furosemide CRI after 6–8 hours
- Creatinine >10 mg/dL (or rapidly rising despite treatment)
- Hyperkalemia (K⁺ >8 mEq/L) refractory to medical management
- Delayed presentation (>24–48h post-ingestion with established AKI)
- Hemodialysis unavailable in anuric patients
- Granular casts and isosthenuria persisting >48h
🌸
CRITICAL
Lilies (Lilium & Hemerocallis spp.)
CATS ONLY All parts toxic — including pollen & vase water. Nephrotoxic to cats. Dogs: GI upset only.
💊 Toxic Dose & Species ▶
ANY AMOUNT in cats is potentially lethal. Even grooming pollen off fur, biting a leaf, or drinking vase water can cause fatal AKI. No safe dose.
| Toxic Lily Species | Non-Nephrotoxic “Lilies” (GI irritants only) |
|---|---|
| Easter lily (Lilium longiflorum) | Peace lily (Spathiphyllum) — oxalate irritant |
| Tiger lily (Lilium tigrinum) | Calla lily (Zantedeschia) — oxalate irritant |
| Asiatic lily (Lilium asiaticum) | Lily of the valley (Convallaria) — cardiac glycosides (different toxicity!) |
| Stargazer lily, Oriental lily | Peruvian lily (Alstroemeria) — mild GI |
| Daylily (Hemerocallis spp.) |
Dogs: Lilium/Hemerocallis spp. cause mild GI signs only (vomiting, inappetence). NOT nephrotoxic in dogs.
🕐 Clinical Signs & Timeline (Cats) ▶
0–2 hours
Vomiting, hypersalivation, anorexia, depression. Pollen may be visible on fur/face.
2–12 hours
Transient improvement in GI signs (“honeymoon period”). Cat may appear better. Do NOT be falsely reassured.
12–24 hours
Depression, dehydration, initial polyuria transitioning to oliguria/anuria. Azotemia begins. Renal pain (hunched posture, reluctance to move).
24–48 hours
Established AKI: Severe azotemia, hyperphosphatemia, hyperkalemia, isosthenuria, glucosuria, tubular casts in sediment. Vomiting resumes (uremic), oral ulcers, uremic breath.
3–7 days
Anuric renal failure, seizures (uremia), death if untreated.
Key point: The “window” for effective treatment is within 6 hours of ingestion. After 18–24 hours, prognosis drops dramatically.
🔬 Diagnostics ▶
| Test | Timing | Expected Findings |
|---|---|---|
| BUN, Creatinine | Baseline (immediate), then q12h × 72h | Azotemia begins 12–24h. Creatinine may be >10 mg/dL by 24–36h in severe cases. |
| SDMA | If available — early marker | May rise before creatinine (reflects 25% nephron loss vs 75%). |
| Phosphorus, Calcium, Potassium | With chemistry panel q12–24h | Hyperphosphatemia, hyperkalemia. Ionized calcium may be low (phosphorus binding). |
| Urinalysis + sediment | Baseline and q12–24h | Glucosuria (early marker of proximal tubular damage — may appear before azotemia), proteinuria, granular casts, isosthenuria (USG 1.008–1.012). |
| Urine output | Continuous (urinary catheter preferred) | Goal >1 mL/kg/hr. |
| Abdominal ultrasound | Within 24h if AKI | Renomegaly, hyperechoic renal cortices, loss of corticomedullary distinction, perirenal effusion. |
Tip: Glucosuria in a normoglycemic cat is a very early indicator of proximal tubular damage — check within 6–12h of ingestion.
💉 Treatment Protocol ▶
DECONTAMINATION (ASAP — ideally within 2 hours)
| Intervention | Dose | Notes |
|---|---|---|
| Dermal decontamination | Bathe/wipe with warm water + mild detergent | Remove all pollen from fur immediately. Critical if pollen exposure. |
| Emesis — Dexmedetomidine | 7 mcg/kg IM | Preferred emetic in cats. Reverse sedation with atipamezole (same volume IM) after emesis. |
| Emesis — Xylazine (alternative) | 0.44 mg/kg IM | Reverse with yohimbine 0.1 mg/kg IV after emesis. |
| Activated charcoal | 1–2 g/kg PO | Limited evidence for lily toxin binding, but still recommended by most sources. Single dose with cathartic. |
IV FLUID THERAPY — THE MOST CRITICAL INTERVENTION
| Intervention | Dose / Rate | Duration | Notes |
|---|---|---|---|
| IV crystalloids (LRS or 0.9% NaCl) | Twice maintenance initially (approx. 6 mL/kg/hr for a 4–5 kg cat) | 48–72 hours minimum; up to 5–7 days if AKI present | Start within 6 hours of ingestion for best outcome. Adjust rate based on hydration, UOP, and cardiovascular status. Monitor for fluid overload (cats prone to pulmonary edema). |
| Maropitant | 1 mg/kg SC or IV q24h | As needed for vomiting | Essential anti-emetic. |
OLIGURIC/ANURIC AKI MANAGEMENT
| Intervention | Dose | Notes |
|---|---|---|
| Furosemide | 2–4 mg/kg IV bolus, then 1–5 mg/kg/hr CRI | Initiate if UOP <1 mL/kg/hr after rehydration. Assess response over 4–6h. |
| Mannitol | 0.25–0.5 g/kg IV over 20 min | Only if still producing some urine. Contraindicated if anuric. |
| Hemodialysis / CRRT | Per facility protocol | REFER EARLY if available. Best chance for anuric cats. Studies show survival with HD even in anuric cases. |
⚠️ Time is everything: Cats treated within 6 hours have >90% survival. Cats presented >18h post-ingestion with established AKI have survival rates <50% without hemodialysis.
📋 Monitoring ▶
| Parameter | Frequency | Target / Action |
|---|---|---|
| Renal values (BUN, Cr, Phos) | q12h for first 72h | Stable or declining values = positive sign. Rising despite fluids = nephron damage ongoing. |
| Urine output | Continuous via urinary catheter | >1 mL/kg/hr. <0.5 → furosemide CRI. 0 → refer for HD. |
| Urine sediment | q24h | Monitor for cast resolution (improving) or persistence (ongoing damage). |
| Potassium | q8–12h | Hyperkalemia (>6.5) → treat with insulin/dextrose and calcium gluconate. |
| Body weight | q12h | Weight gain >5% = fluid overload. Auscultate lungs q4–6h for crackles. |
| Blood pressure | q8–12h | Hypertension common with AKI. |
| PCV/TS | q12–24h | Declining TS may indicate fluid overload or protein loss. |
📊 Prognosis ▶
Excellent prognosis: IV fluids initiated within 6 hours; no azotemia develops.
Guarded prognosis: Mild azotemia that is responsive to fluid diuresis; still polyuric.
🚨 Poor Prognostic Indicators
- Anuria — single most important negative prognostic indicator
- Creatinine >10 mg/dL at presentation
- Treatment delay >18–24 hours post-ingestion
- Oliguria persisting despite furosemide CRI for >6 hours
- Hyperkalemia (K⁺ >8 mEq/L) refractory to medical management
- Persistent isosthenuria + casts + glucosuria beyond 72 hours
- Hemodialysis unavailable
🧅🧄
MODERATE–HIGH
Allium Species (Onion, Garlic, Leek, Chives, Shallots)
DOGS & CATS Cats more susceptible. All forms toxic (raw, cooked, powdered, dehydrated).
💊 Toxic Dose ▶
| Species | Onion Toxic Dose | Garlic Toxic Dose | Notes |
|---|---|---|---|
| Dogs | >15–30 g/kg (single dose) or >0.5% of BW/day repeated | ~15–30 g/kg (less toxic than onion) | Cumulative exposure over days can cause toxicity at lower individual doses. |
| Cats | >5 g/kg | >5 g/kg | 2–3× more susceptible than dogs. Higher concentration of sulfhydryl groups on feline Hb makes it more susceptible to oxidative damage. |
Garlic: 3–5× more potent than onions on a gram-per-gram basis due to higher organosulfoxide concentration. Garlic powder/granulated is even more concentrated. Baby food containing onion powder is a known source in cats.
Breeds at increased risk: Japanese breeds (Akita, Shiba Inu) — have higher erythrocyte sensitivity to oxidative damage. Also cats with pre-existing anemia, zinc deficiency, or concurrent oxidant exposure.
🕐 Clinical Signs & Timeline ▶
0–24 hours
GI phase: Vomiting, diarrhea, abdominal pain, anorexia, hypersalivation. Onion/garlic odor may be present on breath.
1–5 days
Oxidative damage phase: Heinz body formation (visible on new methylene blue stain), eccentrocyte formation, methemoglobinemia (brown/chocolate-colored blood, brown/cyanotic mucous membranes). Hemoglobinuria (dark red-brown urine).
3–5+ days
Hemolytic anemia: Pale mucous membranes, tachycardia, tachypnea, weakness, exercise intolerance, icterus, splenomegaly (extravascular hemolysis). Severe cases: collapse, death.
Delayed onset: Clinical signs of anemia often lag 3–5 days behind ingestion. Initial GI signs may resolve, giving false reassurance before hemolysis becomes apparent.
🔬 Diagnostics ▶
| Test | Timing | Expected Findings |
|---|---|---|
| CBC with PCV/TS | Baseline, then q6–12h if symptomatic | Declining PCV (may drop to <15% in severe cases), regenerative anemia (reticulocytosis by day 3–5). |
| Blood smear (new methylene blue stain) | q24h | Heinz bodies (dark-staining inclusions on RBCs), eccentrocytes (shifted hemoglobin), ghost cells. Cats normally have low numbers of Heinz bodies — >5% is significant. |
| Reticulocyte count | q48–72h | Expect regenerative response by 3–5 days. |
| Methemoglobin level (co-oximetry) | If cyanosis/brown blood | >10% abnormal; >30–40% life-threatening. |
| Serum chemistry (bilirubin, BUN, Cr) | Baseline and q24h | Elevated bilirubin (hemolysis), monitor renal function (hemoglobin nephropathy risk). |
| Urinalysis | Baseline, q24h if hemolysis | Hemoglobinuria (red-brown urine, positive blood on dipstick, no RBCs on sediment). |
💉 Treatment Protocol ▶
DECONTAMINATION (within 2–4 hours)
| Intervention | Dose | Notes |
|---|---|---|
| Emesis | Standard emetic protocols | Effective early. Less useful after GI absorption. |
| Activated charcoal | 1–2 g/kg PO | Single dose with cathartic. Most effective within 1–2h. |
SUPPORTIVE THERAPY
| Intervention | Dose | Route / Frequency | Notes |
|---|---|---|---|
| IV fluids | 1.5–2× maintenance | IV CRI for 24–72h | Maintain hydration, support renal perfusion (protect kidneys from hemoglobin nephropathy). |
| Anti-emetics — Maropitant | 1 mg/kg SC/IV q24h | SC or IV | For GI signs. |
| N-acetylcysteine (NAC) | 140 mg/kg IV loading dose (dilute to 5%, give over 15–20 min), then 70 mg/kg IV q6h × 7 doses | IV | Glutathione precursor — may reduce oxidative RBC damage. Most beneficial if given early. Use in moderate-severe cases. |
| SAMe (S-adenosylmethionine) | 20 mg/kg PO q24h | PO (on empty stomach) | Glutathione precursor. Hepatoprotectant. Continue 2–4 weeks. |
| Vitamin E | 10 IU/kg PO q24h | PO | Antioxidant — limited acute benefit but may support recovery. |
| Ascorbic acid (Vitamin C) | 30 mg/kg PO or IV q6–8h | PO or slow IV | Methemoglobin reductant. Use if methemoglobinemia documented. |
TRANSFUSION (if PCV ≤15% or hemodynamically unstable)
| Product | Dose | Notes |
|---|---|---|
| Packed RBCs | 10–15 mL/kg IV | Preferred if available. Crossmatch first if prior transfusion history. |
| Whole blood | 20 mL/kg IV | If pRBCs unavailable. Type and crossmatch. Cats: ALWAYS blood type first (risk of fatal type B reaction). |
⚠️ Methylene blue (for methemoglobinemia): Dogs: 1.5 mg/kg IV slowly (once). Cats: AVOID — methylene blue itself is an oxidant and worsens Heinz body formation in cats. Use ascorbic acid instead.
📋 Monitoring ▶
| Parameter | Frequency | Action Thresholds |
|---|---|---|
| PCV | q6h if dropping; q12h once stable | <20% → prepare for transfusion; <15% → transfuse. Watch for continued decline over 3–5 days. |
| Blood smear (Heinz bodies) | q24h | Increasing % = ongoing oxidative damage. Declining = recovery. |
| Reticulocyte count | q48–72h | Expect regenerative response by day 3–5. Absent reticulocytosis = marrow suppression or overwhelming hemolysis. |
| Urine color | q6–12h | Dark/red-brown = ongoing hemoglobinuria → risk of hemoglobin nephropathy. Increase IV fluid rate. |
| Renal values | q24h | Monitor for hemoglobin-induced AKI. |
| Heart rate, respiratory rate, mucous membranes | q4–6h | Tachycardia >180 (dogs), >220 (cats), tachypnea, and pale/icteric membranes = worsening anemia. |
📊 Prognosis ▶
Good prognosis: Mild Heinz body formation without significant PCV drop. GI signs only. Most recover in 1–2 weeks with supportive care.
🚨 Poor Prognostic Indicators
- PCV <10–12% unresponsive to transfusion
- Methemoglobinemia >40%
- Hemoglobin-induced AKI (rising creatinine + hemoglobinuria)
- DIC (petechiae, prolonged PT/PTT, thrombocytopenia)
- Cats with concurrent hepatic lipidosis (anorexia-induced)
- Massive single ingestion or prolonged cumulative exposure
🍬
HIGH RISK
Xylitol (Birch Sugar / Sugar Alcohol)
DOGS Found in gum, candy, baked goods, peanut butter, supplements, dental products
💊 Toxic Dose ▶
| Clinical Effect | Dose (mg/kg) | Notes |
|---|---|---|
| Hypoglycemia | >100 mg/kg (0.1 g/kg) | Massive insulin release in dogs. Onset can be within 10–60 min. |
| Hepatic failure | >500 mg/kg (0.5 g/kg) | Hepatocellular necrosis. Some sources cite >1 g/kg. Can occur with or without prior hypoglycemia. |
| Lethal dose | Variable — hepatic failure doses | Death from hepatic failure and coagulopathy. |
Cats: Do not appear to develop hypoglycemia from xylitol (different insulin response). Hepatotoxicity in cats is unreported but theoretically possible. Primary concern in cats is minimal.
Product variability: A single piece of xylitol gum may contain 0.3–1.5 g xylitol. Some peanut butters contain xylitol. Always check labels.
🕐 Clinical Signs & Timeline ▶
10–60 minutes
Hypoglycemia: Vomiting (often the first sign), weakness, ataxia, tremors, collapse. Rapid insulin surge → blood glucose can drop to <40 mg/dL.
1–12 hours
Continued/worsening hypoglycemia. Seizures if BG <30 mg/dL. Some gum formulations → delayed absorption (8–12h). Loss of consciousness, coma.
8–24 hours
Rising liver enzymes (ALT may increase dramatically — often >10,000 U/L in severe cases).
24–72 hours
Acute hepatic failure: Coagulopathy (prolonged PT/PTT), icterus, hepatic encephalopathy, DIC, death. Hypoglycemia may recur due to hepatic failure.
🔬 Diagnostics ▶
| Test | Timing | Expected Findings |
|---|---|---|
| Blood glucose | STAT on presentation, then q1–2h × 12h, then q4–6h | <60 mg/dL = hypoglycemia. <40 mg/dL = severe. Treat immediately. |
| Liver enzymes (ALT, AST, ALP) | Baseline, then q12h × 72h | May rise dramatically by 8–24h. ALT >1000 U/L suggests significant hepatic injury. |
| Bilirubin | q24h | Rising = hepatic failure or hemolysis. |
| Coagulation panel (PT/PTT) | Baseline and q12–24h | Prolongation indicates loss of hepatic synthetic function → DIC risk. |
| Electrolytes, phosphorus | q12–24h | Hypokalemia (insulin-mediated K⁺ shift), hypophosphatemia. |
| Blood ammonia | If encephalopathic signs | Elevated = hepatic encephalopathy. |
💉 Treatment Protocol ▶
DECONTAMINATION
| Intervention | Dose | Notes |
|---|---|---|
| Emesis | Standard protocols | ONLY if asymptomatic and normoglycemic AND within 30 min of ingestion. Do NOT induce emesis if hypoglycemic, symptomatic, or obtunded — aspiration risk. |
| Activated charcoal | NOT RECOMMENDED | Xylitol is rapidly and completely absorbed from GI tract. Charcoal does not effectively bind sugar alcohols. |
HYPOGLYCEMIA MANAGEMENT
| Intervention | Dose | Notes |
|---|---|---|
| Dextrose bolus | 0.5–1 mL/kg of 50% dextrose IV, diluted 1:1 with saline to make 25% | Give over 2–5 min. Recheck BG in 15 min. Repeat if needed. |
| Dextrose CRI | 2.5–5% dextrose added to IV fluids | Maintain BG 80–120 mg/dL. May need 12–24h of supplementation. Taper gradually — do not abruptly discontinue. |
| IV fluids (LRS or 0.9% NaCl) | 1.5–2× maintenance | Vehicle for dextrose CRI. Support hepatic perfusion. |
⚠️ At home (before veterinary care): If dog is conscious but symptomatic, rub corn syrup or honey on gums. Do NOT give oral sugar/food to obtunded or seizing animals (aspiration risk). Transport immediately.
HEPATOPROTECTION (start regardless of liver enzyme status if dose >0.5 g/kg)
| Drug | Dose | Route / Frequency | Duration |
|---|---|---|---|
| N-acetylcysteine (NAC) | 140 mg/kg IV loading (dilute to 5%, over 15–20 min), then 70 mg/kg IV q6h × 7 additional doses | IV | 48 hours (total 8 doses). Glutathione precursor — protects against hepatocellular damage. |
| SAMe | 20 mg/kg PO q24h | PO (empty stomach) | 2–4 weeks or until liver enzymes normalize |
| Silymarin (milk thistle) | 5–10 mg/kg PO q24h | PO | 2–4 weeks |
| Vitamin E | 10 IU/kg PO q24h | PO | 2–4 weeks |
COAGULOPATHY MANAGEMENT
| Intervention | Dose | Notes |
|---|---|---|
| Fresh frozen plasma | 10–15 mL/kg IV | If PT/PTT >25% above normal. Provides clotting factors. Repeat as needed q8–12h. |
| Vitamin K1 | 2.5–5 mg/kg SC initially, then PO q12h | Supports clotting factor synthesis by remaining hepatocytes. Give with fatty food when PO. |
| Whole blood / pRBCs | 20 mL/kg (whole blood) or 10–15 mL/kg (pRBCs) | If hemorrhaging with declining PCV. |
📋 Monitoring ▶
| Parameter | Frequency | Target / Action |
|---|---|---|
| Blood glucose | q1–2h first 12h, then q4–6h | Maintain 80–120 mg/dL. Wean dextrose CRI gradually when BG stable >100 for >6h. |
| ALT, AST | q8–12h first 48h, then q24h | Peaking and declining = recovery. Continued rise = progressive hepatic injury. |
| PT/PTT | q12–24h | Prolongation → administer FFP. Worsening = DIC developing. |
| Bilirubin, albumin | q24h | Rising bilirubin + falling albumin = hepatic failure. |
| Mentation / neurological exam | q4–6h | Altered mentation may be hypoglycemia OR hepatic encephalopathy — check BG immediately. |
| Electrolytes (K⁺, Phos) | q12h | Supplement as needed. |
📊 Prognosis ▶
Good prognosis: Hypoglycemia only (no hepatic involvement), responsive to dextrose, liver enzymes remain normal or mildly elevated.
🚨 Poor Prognostic Indicators
- Acute hepatic failure (ALT >10,000 U/L with rising bilirubin and falling albumin)
- DIC (prolonged PT >25% above normal + thrombocytopenia + hemorrhage)
- Hepatic encephalopathy (obtunded, seizures with normal BG)
- Coagulopathy refractory to FFP
- Hypoglycemia recurring despite continuous dextrose CRI
- Ingestion >1 g/kg with delayed presentation (>6 hours)
🧪
CRITICAL
Ethylene Glycol (Antifreeze)
DOGS & CATS Cats are extremely sensitive. Sweet taste attracts animals.
💊 Toxic Dose ▶
| Species | Minimum Lethal Dose | Notes |
|---|---|---|
| Dogs | 4.4–6.6 mL/kg | ~1 tablespoon/kg |
| Cats | 1.4 mL/kg | ~1 teaspoon for a 4 kg cat can be lethal. Extremely sensitive. |
Toxicity is from metabolites (glycolaldehyde → glycolic acid → oxalic acid → calcium oxalate). The parent compound causes CNS depression; metabolites cause severe metabolic acidosis and renal tubular necrosis from calcium oxalate crystal deposition.
🕐 Clinical Signs & Timeline (3 Stages) ▶
STAGE 1: 30 min – 12 hours (CNS)
“Drunk” appearance: ataxia, knuckling, nausea, vomiting, PU/PD, CNS depression or apparent inebriation, hypothermia. May appear to “improve” after 12h.
STAGE 2: 12–24 hours (Cardiopulmonary)
Tachycardia, tachypnea, progressive dehydration. Severe metabolic acidosis (high anion gap, high osmolar gap). In cats, stage 2 may overlap with stage 3 as early as 12 hours.
STAGE 3: 24–72h dogs / 12–24h cats (Renal)
Oliguric/anuric AKI: Severe azotemia, hyperkalemia, hyperphosphatemia, hypocalcemia. Bilateral renomegaly, painful kidneys. Calcium oxalate monohydrate crystalluria (needle-shaped). Uremic vomiting, oral ulceration, seizures, coma, death.
In cats: Stages progress much faster (stage 3 can begin by 12–18 hours). The treatment window is dramatically shorter.
🔬 Diagnostics ▶
| Test | Timing / Window | Findings |
|---|---|---|
| Ethylene glycol test kit (commercial) | Dogs: positive 1–12h; Cats: positive 1–6h (may be negative by the time of presentation) | Detects EG in serum. False negatives after metabolism. False positives with propylene glycol. |
| Blood gas + electrolytes | STAT and q4–6h | Severe metabolic acidosis, high anion gap (>25–30), high osmolar gap (>10 mOsm/kg early on). Low ionized calcium. |
| Serum osmolality (calculated vs measured) | Early (<12h) | Osmolar gap >10 mOsm/kg suggests presence of unmeasured osmoles (EG). Gap decreases as EG is metabolized. |
| Urinalysis + sediment | q6–12h | Calcium oxalate monohydrate crystals (hippurate/envelope-shaped; later needle/dumbbell). Appears 3h (cats) to 6–8h (dogs) post-ingestion. Fluorescein in some antifreeze → urine may fluoresce under Wood’s lamp (unreliable). |
| BUN, Creatinine, Phos, Ca²⁺ | Baseline, then q6–12h | Rising azotemia, hyperphosphatemia, hypocalcemia (calcium chelated by oxalate). |
| Abdominal ultrasound | If AKI | Bilateral renomegaly, hyperechoic cortices (“cortical rim sign”), perirenal effusion. |
💉 Treatment Protocol ▶
DECONTAMINATION (within 1–2 hours — EG is rapidly absorbed)
| Intervention | Notes |
|---|---|
| Emesis | Only if within 1 hour and patient is alert. Rapid absorption limits utility. |
| Activated charcoal | Poorly binds EG. Generally NOT recommended (limited benefit, delays antidote administration). |
ANTIDOTE — FOMEPIZOLE (4-MP) [PREFERRED]
Fomepizole competitively inhibits alcohol dehydrogenase, preventing metabolism of EG to toxic metabolites. Must be given BEFORE renal damage occurs — within 8–12h (dogs) or 3h (cats) of ingestion for best results.
| Species | Loading Dose | Subsequent Doses | Notes |
|---|---|---|---|
| Dogs | 20 mg/kg IV (dilute, give over 15–30 min) | 15 mg/kg IV at 12h and 24h, then 5 mg/kg IV at 36h | Continue until EG levels undetectable or osmolar gap normalizes. |
| Cats | 125 mg/kg IV | 31.25 mg/kg IV at 12h, 24h, and 36h | Cats require much higher doses due to pharmacokinetic differences. Expensive but life-saving. |
ALTERNATIVE ANTIDOTE — ETHANOL 20% (if fomepizole unavailable)
Ethanol also competitively inhibits alcohol dehydrogenase. Inferior to fomepizole (more side effects: profound CNS depression, respiratory depression, worsening acidosis, hyperosmolality). Use ONLY if fomepizole unavailable.
| Species | Dose (20% ethanol) | Frequency | Duration |
|---|---|---|---|
| Dogs | 5.5 mL/kg IV | q4h × 5 treatments, then q6h × 4 treatments | ~36–48h total |
| Cats | 5 mL/kg IV | q6h × 5 treatments, then q8h × 4 treatments | ~48h total |
SUPPORTIVE CARE
| Intervention | Dose | Notes |
|---|---|---|
| IV fluids — 0.9% NaCl | 2–3× maintenance | Avoid LRS initially (calcium-containing fluids may worsen calcium oxalate crystal deposition). Switch to LRS after antidote treatment phase. |
| Sodium bicarbonate | 1–2 mEq/kg IV slowly | ONLY if pH <7.1 or HCO₃⁻ <12 mEq/L. Correct slowly — rapid correction worsens CNS acidosis. |
| Calcium gluconate 10% | 0.5–1.5 mL/kg IV slowly over 10–15 min | For symptomatic hypocalcemia (muscle tremors, seizures, ECG changes). Monitor ECG during infusion — bradycardia = stop. |
| Furosemide | 2–6 mg/kg IV | If oliguric despite rehydration. |
| Hemodialysis | Per facility protocol | IDEAL — removes EG and toxic metabolites directly. Refer ASAP if available. Best chance for anuric patients. |
📋 Monitoring ▶
| Parameter | Frequency | Target / Action |
|---|---|---|
| Blood gas, electrolytes, osmolality | q4–6h during antidote therapy | Resolving acidosis and narrowing osmolar gap = antidote working. Worsening = inadequate antidote dosing or late presentation. |
| Renal values (BUN, Cr, Phos) | q6–12h | Stable = good. Rising despite antidote = renal damage already occurred. |
| Urine output | Continuous | >1 mL/kg/hr. <0.5 = oliguric → escalate therapy. |
| Urine sediment | q6–12h | New calcium oxalate crystals = ongoing oxalate production = antidote may be insufficient. |
| Ionized calcium | q6–12h | Supplement if <0.9 mmol/L or clinical signs of hypocalcemia. |
| CNS status | q2–4h | Improving mentation during antidote therapy = positive sign. |
📊 Prognosis ▶
Good prognosis: Fomepizole administered within 5 hours (dogs) or 3 hours (cats) — before renal damage. Nearly 100% survival if treated in time.
🚨 Poor Prognostic Indicators
- Anuria — most significant negative indicator
- Calcium oxalate crystals already present in urine at presentation
- Severe metabolic acidosis (pH <7.0) unresponsive to bicarbonate
- Rapidly rising creatinine despite antidote and fluids
- Cats presenting >3–6 hours post-ingestion (often already in stage 3)
- Dogs presenting >12–18 hours post-ingestion with established AKI
- Hemodialysis unavailable in anuric patients
- CNS signs (seizures, coma) in stage 3
💊
CRITICAL IN CATS
Acetaminophen (Paracetamol / Tylenol)
DOGS & CATS Cats are EXTREMELY sensitive — methemoglobinemia + hepatotoxicity
💊 Toxic Dose ▶
| Species | Dose | Clinical Effect |
|---|---|---|
| Dogs | >100 mg/kg | Hepatotoxicity (NAPQI metabolite) |
| >200 mg/kg | Methemoglobinemia + hepatotoxicity. Potentially lethal. | |
| Cats | >10 mg/kg (as low as 50 mg total) | Methemoglobinemia, Heinz body hemolytic anemia, hepatotoxicity |
| One regular-strength tablet (325 mg) or half of extra-strength (500 mg) | Can be fatal to a cat |
Cats lack efficient glucuronidation (UDP-glucuronosyltransferase deficiency) → rely on sulfation pathway → pathway saturated quickly → NAPQI (toxic metabolite) accumulates → methemoglobinemia and hepatocellular necrosis.
🕐 Clinical Signs & Timeline ▶
CATS:
1–4 hours
Vomiting, hypersalivation, depression, anorexia.
4–12 hours
Methemoglobinemia: Cyanosis, brown/chocolate-colored mucous membranes, tachypnea, dyspnea, weakness. Blood appears dark brown (“chocolate blood”).
18–36 hours
Facial and paw edema (characteristic of acetaminophen toxicosis in cats). Periorbital swelling.
24–72 hours
Heinz body hemolytic anemia (PCV dropping), hepatic failure (elevated liver enzymes, jaundice, coagulopathy), death.
DOGS:
1–4 hours
Vomiting, anorexia. Often subclinical initially.
24–48 hours
Hepatotoxicity: Elevated ALT/AST, icterus, abdominal pain.
48–96 hours
Hepatic failure (very high doses), coagulopathy, hepatic encephalopathy. Methemoglobinemia only at very high doses (>200 mg/kg).
💉 Treatment Protocol ▶
DECONTAMINATION (within 1–2 hours)
| Intervention | Dose | Notes |
|---|---|---|
| Emesis | Standard protocols | Only if asymptomatic and within 1–2h. Do NOT induce if cyanotic or dyspneic. |
| Activated charcoal | 1–2 g/kg PO | Most effective within 1–2h. Single dose with cathartic. |
ANTIDOTE — N-ACETYLCYSTEINE (NAC) [most critical treatment]
| Dose | Route | Schedule | Notes |
|---|---|---|---|
| 140 mg/kg loading dose | IV preferred (dilute to 5% in D5W or 0.9% NaCl, give over 15–20 min) | ASAP | PO if IV not available (mix with cola or water to improve palatability). Can cause vomiting PO. |
| 70 mg/kg | IV q6h | × 7 additional doses (total 8 doses over 48h) | Glutathione precursor — replenishes hepatic glutathione stores, detoxifies NAPQI. Start even if >24h post-ingestion — still beneficial. |
NAC side effects: Anaphylactoid reactions (urticaria, facial swelling, vomiting) — rare. If occurs, slow infusion rate. Pretreatment with diphenhydramine 2 mg/kg IM can reduce risk.
ADDITIONAL TREATMENTS
| Drug | Dose | Route / Frequency | Indication |
|---|---|---|---|
| Ascorbic acid (Vitamin C) | 30 mg/kg PO or IV slowly q6–8h | PO or slow IV | Reduces methemoglobin to hemoglobin. Especially important in CATS. Continue until MetHb <10%. |
| SAMe | 20 mg/kg PO q24h | PO (empty stomach) | Glutathione precursor — synergistic with NAC for hepatoprotection. Continue 2–4 weeks. |
| Cimetidine | 5–10 mg/kg PO or IV q6–8h | PO or slow IV | P450 inhibitor — may reduce NAPQI production. Evidence debated but still used in practice. |
| IV fluids | 1.5–2× maintenance | IV CRI | Support hepatic & renal perfusion. Continue 48–72h minimum. |
| Oxygen therapy | Flow-by or O₂ cage | Continuous | If MetHb >20% and dyspneic. O₂ supplementation helps but does NOT reduce MetHb — need reducing agents. |
| Blood transfusion (pRBCs or whole blood) | 10–15 mL/kg pRBCs or 20 mL/kg whole blood | IV | If PCV <15% or hemodynamically unstable from hemolytic anemia (cats). |
⚠️ Methylene blue: Dogs: 1.5 mg/kg IV once (slowly). CATS: AVOID — methylene blue is itself an oxidant in cats and will WORSEN Heinz body formation. Use ascorbic acid instead.
📋 Monitoring ▶
| Parameter | Frequency | Target / Action |
|---|---|---|
| Methemoglobin level (co-oximetry) | q4–6h until <10% | >30% = severe; >50% = life-threatening. Treat with ascorbic acid ± transfusion. |
| PCV/TS, blood smear | q6–12h (cats); q12–24h (dogs) | Declining PCV with Heinz bodies = ongoing hemolysis. <15% → transfuse. |
| Liver enzymes (ALT, AST) | q12–24h × 72h | Peak ALT typically 48–72h post-ingestion. Declining = recovery. |
| PT/PTT | q24h if hepatic involvement | Prolongation = hepatic failure → administer FFP. |
| Mucous membrane color | q2–4h | Brown/muddy = MetHb. Pale/white = anemia. Yellow = icterus/hepatic. |
| Respiratory rate + SpO₂ | q2–4h | Note: pulse oximetry is UNRELIABLE with methemoglobinemia (reads falsely around 85%). Use co-oximetry. |
Pulse oximetry caveat: Standard pulse oximeters cannot distinguish MetHb from HbO₂ — readings plateau around 85% regardless of true oxygenation. Co-oximetry or clinical assessment is more reliable.
📊 Prognosis ▶
Dogs: Good if <200 mg/kg and treated early with NAC. Most survive with appropriate treatment.
Cats: Guarded even at low doses. Survival improves significantly with NAC started within 2–4 hours.
🚨 Poor Prognostic Indicators
- MetHb >50% despite ascorbic acid treatment
- PCV <10% not responsive to transfusion
- Fulminant hepatic failure (ALT >10,000, DIC, encephalopathy)
- Treatment delay >8–12 hours (cats) or >24h (dogs)
- Concurrent renal failure
- Multiple acetaminophen tablets ingested by a cat
🐀
HIGH RISK
Anticoagulant Rodenticides
DOGS & CATS 1st gen (warfarin) & 2nd gen (brodifacoum, bromadiolone, chlorophacinone, diphacinone)
🕐 Clinical Signs & Timeline ▶
0–24 hours
Usually NO clinical signs. Stored vitamin K–dependent clotting factors (II, VII, IX, X) still circulating. Some GI irritation.
24–36 hours
PT begins to prolong (Factor VII has shortest half-life: ~6h in dogs).
3–5 days
Clinical hemorrhage: Lethargy, weakness, pale mucous membranes, dyspnea (pulmonary/pleural hemorrhage), cough (hemoptysis), subcutaneous hematoma, epistaxis, hematuria, melena, hemarthrosis, hemorrhagic effusions. Can present as sudden collapse/death.
Relay toxicity: Dogs/cats eating a poisoned rodent can be affected. Second-generation anticoagulants have long tissue half-lives (weeks to months).
🔬 Diagnostics ▶
| Test | Timing | Findings |
|---|---|---|
| PT (most sensitive) | 48–72h post-ingestion (if decontaminated and monitoring); or at presentation if bleeding | Prolonged first (Factor VII depleted earliest). PT >25% above normal = significant. |
| PTT | With PT | Prolongs later than PT (Factor IX, X, II have longer half-lives). |
| PIVKA (Proteins Invoked by Vitamin K Absence) | May detect coagulopathy earlier than PT | More sensitive than PT in some studies. |
| PCV/TS | q6–12h if bleeding | Declining PCV = ongoing hemorrhage. |
| Thoracic radiographs | If dyspneic | Pleural effusion, pulmonary hemorrhage/consolidation, mediastinal hemorrhage. |
| Abdominal ultrasound | If abdominal effusion suspected | Free abdominal fluid (hemorrhage). |
| Abdominocentesis / Thoracocentesis | If effusion present | Hemorrhagic effusion with PCV similar to peripheral blood. |
| Toxicology screen | If product unknown | Send bait/vomitus for identification if possible. |
💉 Treatment Protocol ▶
DECONTAMINATION (within 4 hours — ideally <2h)
| Intervention | Dose | Notes |
|---|---|---|
| Emesis | Standard protocols | Most effective within 2h. Still attempt up to 4h (bait often sits in stomach). |
| Activated charcoal | 1–2 g/kg PO with cathartic | Single dose. Binds rodenticide well. |
VITAMIN K1 THERAPY — Cornerstone of Treatment
| Drug | Dose | Route | Frequency | Duration | Critical Notes |
|---|---|---|---|---|---|
| Vitamin K1 (Phytonadione) | 2.5–5 mg/kg | PO (preferred — best absorption). Give WITH A FATTY MEAL (canned food, cheese, butter) to enhance absorption. | q12h | 1st gen (warfarin): 7–14 days 2nd gen (brodifacoum, etc.): 4–6 weeks (some cases 6–8 weeks) | SC for initial dose if vomiting. NEVER give IV (anaphylaxis risk). NEVER give IM (hematoma risk in coagulopathic patient). |
⚠️ After stopping Vitamin K1: Recheck PT 48–72 hours after last dose. If PT is prolonged → restart Vitamin K1 for 2 more weeks and recheck again. Do NOT rely on clinical signs alone.
ACTIVE HEMORRHAGE MANAGEMENT
| Intervention | Dose | Notes |
|---|---|---|
| Fresh frozen plasma (FFP) | 10–15 mL/kg IV | Provides immediate clotting factors. Repeat q6–12h as needed. Takes 6–12h for Vitamin K1 to restore clotting factor synthesis. |
| Fresh whole blood | 20 mL/kg IV | If PCV dropping + need clotting factors simultaneously. |
| Packed RBCs | 10–15 mL/kg IV | If anemic but clotting factors adequate (after FFP given separately). |
| Vitamin K1 (initial dose if actively bleeding) | 2.5–5 mg/kg SC | SC (not IM) for first dose. Switch to PO with food once vomiting controlled. Takes 6–12h to work. |
| Oxygen therapy | Flow-by or O₂ cage | If dyspneic from pulmonary/pleural hemorrhage. |
| Thoracocentesis | As needed | Life-saving if large-volume pleural hemorrhage causing respiratory compromise. |
| Cage rest | STRICT | Activity increases hemorrhage risk. Complete cage rest until PT normalizes. |
📋 Monitoring ▶
| Parameter | Frequency | Target / Action |
|---|---|---|
| PT | 48–72h after starting Vitamin K1 (confirm response), then 48–72h after STOPPING Vitamin K1 | Normal PT on treatment = adequate dose. Prolonged PT 48–72h after stopping = restart for 2 more weeks. |
| PCV/TS | q6–12h if actively hemorrhaging | <20% → transfuse. Stabilizing = hemorrhage controlled. |
| Respiratory rate + effort | q2–4h initially | Worsening dyspnea → thoracic radiographs → thoracocentesis if indicated. |
| Mucous membrane color, CRT | q4–6h | Pale + prolonged CRT = ongoing hemorrhage or severe anemia. |
| Blood pressure | q4–6h if hemorrhaging | Hypotension → increase fluid rate, consider vasopressor if refractory. |
📊 Prognosis ▶
Excellent prognosis: Decontaminated early or treated with Vitamin K1 before hemorrhage occurs. Vast majority survive with appropriate therapy.
🚨 Poor Prognostic Indicators
- Massive pulmonary hemorrhage requiring mechanical ventilation
- Pericardial effusion / cardiac tamponade
- Intracranial hemorrhage (seizures, neurological deficits)
- DIC
- PCV <10% unresponsive to transfusion
- Hemorrhagic shock unresponsive to fluid resuscitation + blood products
- Unknown product with delayed presentation
🐱
CRITICAL IN CATS
Permethrin / Pyrethroid Toxicosis
CATS Application of dog flea products to cats. Deficient glucuronidation.
🕐 Clinical Signs & Timeline ▶
1–12 hours post-exposure
Early signs: Ear twitching, paw flicking, facial fasciculations, hypersalivation, hyperesthesia. May appear agitated.
6–24 hours
Generalized muscle tremors (fine to coarse), ataxia, seizures (generalized tonic-clonic), hyperthermia (from sustained muscle activity), mydriasis.
24–72 hours if untreated
Status epilepticus, severe hyperthermia (>106°F), rhabdomyolysis → AKI, respiratory failure, death.
💉 Treatment Protocol ▶
DECONTAMINATION — IMMEDIATE
| Intervention | Notes |
|---|---|
| Bathe thoroughly | Use warm water + liquid dish soap (Dawn). NOT insecticidal shampoo. Lather and rinse 2–3 times. Clip fur if heavily contaminated. Dry thoroughly after to prevent hypothermia. Wear gloves. |
TREMOR & SEIZURE CONTROL
| Drug | Dose | Route | Notes |
|---|---|---|---|
| Methocarbamol (FIRST-LINE for tremors) | 55–220 mg/kg IV slowly (max 330 mg/kg/day) | IV (do not exceed 2 mL/min) | Excellent for pyrethroid tremors specifically. Can repeat to effect. Monitor respiratory rate. |
| Diazepam | 0.5–1 mg/kg IV | IV PRN for acute seizures | Good for acute seizure control but does not stop tremors as well as methocarbamol. |
| Propofol (if refractory) | 1–4 mg/kg IV bolus, then 0.1–0.4 mg/kg/min CRI | IV | Requires intubation and ventilatory support if CRI. Reserve for refractory cases. |
| Phenobarbital | 2–4 mg/kg IV q6h | IV | Add if diazepam + methocarbamol inadequate. |
| Intralipid (ILE) 20% | 1.5 mL/kg IV bolus over 15 min, then 0.25 mL/kg/min CRI for 30–60 min | IV | Lipid sink for lipophilic permethrin. Case reports show clinical improvement. May repeat bolus once. Monitor for lipemia, pancreatitis. |
SUPPORTIVE CARE
| Intervention | Details |
|---|---|
| IV fluids | LRS at 1.5–2× maintenance for 48–72h. Protect kidneys from myoglobin (rhabdomyolysis). |
| Active cooling | If temp >104°F (40°C): fans, cool water on paws/ears/groin, cool IV fluids. STOP cooling at 103.5°F to prevent overshoot hypothermia. |
| Nutritional support | Offer food when able. Assisted feeding if hospitalized >3 days (cats prone to hepatic lipidosis). |
📋 Monitoring ▶
| Parameter | Frequency | Action |
|---|---|---|
| Temperature | q2h while tremoring | >104°F → active cooling. >106°F → critical, risk of organ failure. |
| Tremor severity score | q2–4h | Improving = reducing methocarbamol. Worsening = re-bolus or increase CRI. |
| CK (creatine kinase) | q12–24h | Markedly elevated = rhabdomyolysis → increase fluid rate, monitor renal values. |
| Renal values (BUN, Cr) | q24h | Rising = myoglobin-induced AKI. Increase fluid rate. |
| Blood glucose | q6–12h | Hypoglycemia possible with sustained tremoring and anorexia. |
📊 Prognosis ▶
Good to excellent: Most cats recover in 24–72 hours with aggressive treatment. Survival rate >90% with appropriate care.
🚨 Poor Prognostic Indicators
- Status epilepticus refractory to propofol CRI
- Severe hyperthermia (>106°F / 41.1°C) sustained >30 min
- Rhabdomyolysis (CK >10,000 U/L) with AKI
- Treatment delay >24 hours
- Multi-organ failure
📦
LOW (Silica) / MODERATE (Iron)
Desiccants (Silica Gel, Oxygen Absorbers)
DOGS & CATS Silica gel = low toxicity. Iron-based oxygen absorbers = potential iron toxicity.
💊 Product Identification & Toxicity ▶
| Product | Contents | Toxicity |
|---|---|---|
| Silica gel packets (“Do Not Eat”) | Silicon dioxide (inert) | NON-TOXIC. Mild GI irritation at most. Foreign body risk if large packet ingested. |
| Silica gel with moisture indicator | May contain cobalt chloride (blue/pink beads) | Low toxicity. Mild GI irritation. Cobalt chloride in very large amounts could theoretically cause GI upset. |
| Iron-based oxygen absorbers (found in beef jerky, pet treats, dried foods) | Elemental iron (powdered) | POTENTIALLY TOXIC. Iron toxicity if ingested in quantity. Elemental iron >20 mg/kg = GI signs; >60 mg/kg = systemic toxicity. |
Key distinction: Silica gel (clear/white beads, “DO NOT EAT” packets) ≠ Oxygen absorbers (dark powder in sealed packets, often with a magnet — iron-containing). Oxygen absorbers look different and are the ones that matter clinically.
💉 Treatment ▶
SILICA GEL:
| Intervention | Notes |
|---|---|
| Home monitoring | Observe for 24h. Mild vomiting/diarrhea may occur and is self-limiting. |
| Emesis | Generally NOT indicated for small silica gel packets. |
| Radiographs | Only if concern for GI obstruction from packet material. |
IRON-BASED OXYGEN ABSORBERS (if >20 mg/kg elemental iron):
| Intervention | Dose | Notes |
|---|---|---|
| Emesis | Standard protocols | Within 1–2 hours. |
| Whole bowel irrigation (if large ingestion) | GoLYTELY: 25 mL/kg/hr PO/NG | For significant iron ingestion not removed by emesis. Do NOT give activated charcoal (does not bind iron). |
| Deferoxamine (chelator) | 10–15 mg/kg/hr IV CRI (max 80 mg/kg/day) | For serum iron >500 mcg/dL or symptomatic. Urine turns “vin rosé” color when chelating. |
| GI protectants | Omeprazole 1 mg/kg PO q24h, sucralfate 0.5–1 g PO q8h | Iron is directly corrosive to GI mucosa. |
| IV fluids | 1.5–2× maintenance | Support perfusion, treat dehydration from GI losses. |
Activated charcoal does NOT bind iron. Use whole bowel irrigation instead for decontamination of iron ingestion.
📊 Prognosis ▶
Silica gel: Excellent prognosis. No treatment typically needed.
Iron oxygen absorbers: Good if treated early. Guarded if serum iron >500 mcg/dL. Poor indicators include hepatic failure (24–48h post-ingestion), GI perforation, severe metabolic acidosis.
🧴
LOW–MODERATE
Detergents, Soaps & Laundry Pods
DOGS & CATS Anionic/nonionic = low risk. Cationic = corrosive. Laundry pods = concentrated & alkaline.
💊 Product Classification ▶
| Type | Examples | Toxicity Level |
|---|---|---|
| Anionic/Nonionic | Most dish soaps, laundry detergent (dilute), hand soap, shampoos | Low. GI irritation, vomiting, diarrhea, drooling. |
| Cationic | Fabric softeners, some disinfectants (benzalkonium chloride), sanitizers | Moderate–High. Corrosive to mucous membranes, esophagus, stomach. |
| Laundry/dishwasher pods | Concentrated detergent pods | Moderate. Highly concentrated, alkaline; risk of mucosal burns, corneal injury if squirted into eyes, aspiration pneumonia. |
🕐 Clinical Signs ▶
Minutes to 1 hour
Anionic/Nonionic: Drooling, lip licking, vomiting, diarrhea. Self-limiting within 12–24h.
Minutes to hours
Cationic: Severe oral pain, hypersalivation, pawing at mouth, oral ulceration/erythema, dysphagia, vomiting, esophageal burns. Stridor if laryngeal edema.
Hours to days
Cationic/pods severe cases: Esophageal stricture (days to weeks later), aspiration pneumonia, corneal ulceration (if ocular exposure).
💉 Treatment ▶
⚠️ DO NOT induce emesis — especially for cationic detergents and pods. Re-exposure of corrosive to esophagus worsens injury. Aspiration risk.
| Intervention | Dose / Details | When |
|---|---|---|
| Dilute orally | Small amount of water or milk offered voluntarily | Immediately. Dilutes irritant. |
| Sucralfate | Dogs: 0.5–1 g PO q8h; Cats: 0.25 g PO q8–12h | For mucosal protection. Especially cationic exposures. |
| Omeprazole | 1 mg/kg PO q12–24h | Reduce gastric acid — protect damaged mucosa. 5–7 days minimum for corrosive injury. |
| Maropitant | 1 mg/kg SC/IV q24h | Anti-emetic if vomiting. |
| Pain management (cationic burns) | Buprenorphine: Cats 0.02 mg/kg buccal/IV q6–8h; Dogs 0.01–0.02 mg/kg IV q6–8h. Or hydromorphone (dogs): 0.05–0.1 mg/kg IV q4–6h | For oral/esophageal pain from corrosive injury. |
| Ocular irrigation | Copious sterile saline for 15–20 min | If ocular exposure (especially pods). Then fluorescein stain to check for corneal ulceration. |
| Endoscopy | — | If cationic/concentrated product: consider esophagoscopy at 24–48h to assess burn severity and stricture risk. |
📊 Prognosis ▶
Anionic/Nonionic: Excellent. Self-limiting GI signs.
Cationic/Pods: Guarded if severe esophageal burns. Risk of esophageal stricture requiring balloon dilation or stenting. Aspiration pneumonia may be fatal.
🚨 Poor Prognostic Indicators (Cationic/Pods)
- Full-thickness esophageal burns
- Aspiration pneumonia
- Laryngeal edema causing respiratory obstruction
- Esophageal perforation
💊
HIGH RISK
NSAIDs (Ibuprofen, Naproxen, Meloxicam OD)
DOGS & CATS Cats are extremely sensitive. GI ulceration, AKI, CNS toxicity.
💊 Toxic Dose (Ibuprofen) ▶
| Species | Dose (mg/kg) | Effect |
|---|---|---|
| Dogs | >25 mg/kg | GI signs (vomiting, diarrhea) |
| >100 mg/kg | AKI (renal papillary necrosis) | |
| >400 mg/kg | CNS toxicity (seizures, coma) | |
| Cats | >3–5 mg/kg | GI, renal, and potentially CNS toxicity at much lower doses due to prolonged half-life and deficient metabolism. |
Naproxen has a very long half-life in dogs (~72h) making it particularly dangerous. Toxic at >5 mg/kg in dogs.
🕐 Clinical Signs & Timeline ▶
2–6 hours
GI signs: Vomiting (±hematemesis), diarrhea, abdominal pain, anorexia, nausea.
12–24 hours
GI ulceration: Melena, hematemesis, abdominal guarding. Risk of GI perforation.
24–72 hours
AKI: Oliguria, azotemia (especially with dehydration, pre-existing renal disease, or concurrent nephrotoxins).
Very high doses
CNS: Depression, ataxia, seizures, coma.
💉 Treatment Protocol ▶
| Intervention | Dose | Notes |
|---|---|---|
| Emesis | Standard protocols within 2h | Effective early. |
| Activated charcoal | 1–2 g/kg PO; consider repeat dose at 1 g/kg q8h × 2 (naproxen — enterohepatic recirculation) | Effective for NSAIDs. Repeat dosing for naproxen specifically. |
| IV fluids | 2× maintenance for 48–72h | Renal protection — essential. |
| Omeprazole | 1–2 mg/kg PO q12h (dogs); 1 mg/kg PO q24h (cats) | GI protectant. Continue 5–7 days minimum. |
| Pantoprazole (if vomiting/GI hemorrhage) | 1 mg/kg IV q12h | IV PPI for active GI hemorrhage. Switch to oral PPI when able. |
| Sucralfate | Dogs: 0.5–1 g PO q8h; Cats: 0.25 g PO q8–12h | Mucosal protectant. Give 1–2h apart from other oral meds (interferes with absorption). |
| Misoprostol | 2–5 mcg/kg PO q8h (dogs) | Synthetic PGE1 analogue — replaces protective prostaglandins inhibited by NSAIDs. Not commonly used in cats. |
| Maropitant | 1 mg/kg SC/IV q24h | Anti-emetic. |
| Diazepam | 0.5–1 mg/kg IV PRN | Seizure control at very high doses. |
⚠️ GI perforation: If pneumoperitoneum on radiographs → emergency surgical exploration. Medical management alone is inadequate.
📊 Prognosis ▶
Good: Low-dose ingestion with early decontamination and GI protection.
🚨 Poor Prognostic Indicators
- GI perforation (pneumoperitoneum, septic abdomen)
- Oliguric/anuric AKI unresponsive to fluid therapy
- Seizures / coma (very high doses)
- Cats with any significant ibuprofen ingestion (>10 mg/kg)
- Pre-existing renal disease with NSAID exposure
🌿
MODERATE
Cannabis / Marijuana / THC Edibles
DOGS & CATS Dogs more commonly affected. Edibles may contain xylitol or chocolate.
🕐 Clinical Signs & Timeline ▶
30 min – 3 hours (ingestion)
Ataxia (“drunken” gait), lethargy or hyperexcitability, urinary incontinence (classic sign), mydriasis, bradycardia (sometimes tachycardia), hypothermia, hypersalivation, vomiting, startle response to stimuli.
3–12 hours
Profound sedation/obtundation, static ataxia, tremors. May dribble urine.
12–72 hours
Signs typically resolve over 24–72h. Severe cases (edibles, concentrates): prolonged obtundation, tremors, seizures (rare), coma.
CHECK FOR CO-INGESTANTS: THC edibles may contain chocolate, xylitol, or raisins — treat for those toxicoses concurrently if present.
💉 Treatment Protocol ▶
| Intervention | Dose | Notes |
|---|---|---|
| Emesis | Standard — within 30 min | THC has antiemetic properties — emesis may be difficult to induce. Attempt if recent ingestion. |
| Activated charcoal | 1–2 g/kg PO | If within 1–2h and no aspiration risk. |
| IV fluids | Maintenance rate | Maintain hydration, support thermoregulation. |
| Intralipid (ILE) 20% | 1.5 mL/kg IV bolus over 15 min, then 0.25 mL/kg/min × 30–60 min | For severe cases (coma, prolonged obtundation). THC is highly lipophilic — lipid sink effect. Case reports show dramatic improvement. |
| Thermoregulation | External warming | Hypothermia common. Keep warm and dry. |
| Diazepam | 0.5–1 mg/kg IV | Only if seizures (rare). |
| Maropitant | 1 mg/kg SC/IV q24h | If persistent vomiting. |
| Atropine | 0.02–0.04 mg/kg IV/IM | Only if symptomatic bradycardia (HR <40–50 bpm). Rarely needed. |
📊 Prognosis ▶
Generally good to excellent: Most recover fully in 24–72h with supportive care. Deaths are rare and usually associated with co-ingestants (chocolate, xylitol) or aspiration pneumonia.
🚨 Poor Prognostic Indicators
- Coma lasting >24 hours despite ILE
- Aspiration pneumonia
- Concurrent toxin ingestion (xylitol, chocolate, raisins in edibles)
- Concentrated THC products (wax, shatter, butter) — much higher doses
📚 Key References & Resources
1. Peterson ME, Talcott PA. Small Animal Toxicology. 3rd ed. Elsevier; 2013.
2. Plumb DC. Plumb’s Veterinary Drug Handbook. 9th ed. Wiley-Blackwell; 2018.
3. Silverstein DC, Hopper K. Small Animal Critical Care Medicine. 3rd ed. Elsevier; 2023.
4. BSAVA. Manual of Canine and Feline Emergency and Critical Care. 3rd ed. 2018.
5. ASPCA Animal Poison Control Center (888-426-4435). Clinical Toxicology Database.
6. Pet Poison Helpline (855-764-7661). www.petpoisonhelpline.com
7. Gwaltney-Brant SM, et al. Grape and raisin toxicity in dogs. JAVMA. 2023.
8. Connally HE, et al. Safety and efficacy of 4-methylpyrazole for treatment of ethylene glycol intoxication in cats. Am J Vet Res. 2010;71(1):39-45.
9. Brutlag A, Hovda LR. Xylitol toxicosis in dogs. Vet Med. 2015.
10. Cortinovis C, Caloni F. Household food items toxic to dogs and cats. Front Vet Sci. 2016;3:26.
11. Means C. Lily toxicosis in cats. Vet Med. 2021.
12. VIN (Veterinary Information Network). Toxicology Databases & Clinical Rounds. www.vin.com
Drug doses should always be verified against current formularies. This reference is intended as a clinical aid and does not replace clinical judgment or poison control consultation.