Chocolate Toxicity Calculator for Dogs
Merck Veterinary Manual reports mild chocolate poisoning signs from about 20 mg/kg of methylxanthines, heart effects at 40–50 mg/kg and seizures at about 60 mg/kg, so dark and baking chocolate become dangerous in far smaller amounts than milk chocolate. (Merck Veterinary Manual; Pet Poison Helpline)
Chocolate toxicity calculator
Educational estimate from published toxicology references. Not veterinary advice. If in doubt, call your vet.
Source: USDA FoodData Central, SR Legacy. Select a candy for its FDC source.
Values are USDA laboratory averages; actual products vary. Fun-size weights vary by bag, so check the wrapper.
Risk level (example)
Monitor (lower risk)
Estimated dose: 4.3 mg/kg
- Watch for vomiting, restlessness, panting or a racing heart for 24 hours.
- Call your vet if any sign appears or the amount may be higher.
- Note the product, amount and time eaten; keep the packaging.
Emergency line
ASPCA APCC (888) 426-4435, fee may apply · Pet Poison Helpline (855) 764-7661, fee may apply
How thresholds are set: Merck Veterinary Manual reports mild signs (vomiting, restlessness) from about 20 mg/kg of methylxanthines (theobromine plus caffeine), heart effects at about 40–50 mg/kg and seizures at about 60 mg/kg. The estimate uses approximate methylxanthine content per chocolate type; real products vary.
Source: Merck Veterinary Manual — chocolate toxicosis; Pet Poison Helpline — chocolate
Educational estimate from published toxicology references. Not veterinary advice. If in doubt, call your vet.
Result tiers and what to do now
Monitor (lower risk) — Below ~20 mg/kg
Watch for vomiting, restlessness, panting or a racing heart for 24 hours; call your vet if any sign appears. (Merck Veterinary Manual)
Call your vet — ~20–40 mg/kg
Call your vet or a poison hotline now for advice. (Merck Veterinary Manual)
Call your vet now — ~40–60 mg/kg
Call right away; heart effects are reported at 40–50 mg/kg and treatment works best early. (Merck Veterinary Manual)
Emergency — ≥ ~60 mg/kg
Go to the nearest emergency vet now; seizures are reported from about 60 mg/kg. (Merck Veterinary Manual)
Call for help
Call your vet or an emergency clinic. ASPCA Animal Poison Control Center (888) 426-4435 or Pet Poison Helpline (855) 764-7661 (fees may apply). Never induce vomiting without a vet's say-so.
Dose by dog weight
| Dog weight | Milk (~58 mg/oz) | Dark (~150 mg/oz) | Baking (~450 mg/oz) |
|---|---|---|---|
| 5 lb (2.3 kg) | 0.8 oz | 0.3 oz | 0.1 oz |
| 10 lb (4.5 kg) | 1.6 oz | 0.6 oz | 0.2 oz |
| 20 lb (9.1 kg) | 3.1 oz | 1.2 oz | 0.4 oz |
| 40 lb (18.1 kg) | 6.3 oz | 2.4 oz | 0.8 oz |
| 80 lb (36.3 kg) | 13 oz | 4.8 oz | 1.6 oz |
Methylxanthine content is approximate and varies by brand. Heart effects are reported at about twice these amounts and seizures at about three times. Published ranges are not safe allowances.
Frequently asked questions
How much chocolate is toxic to a dog?
It depends on the type and your dog's weight. Merck reports mild signs from about 20 mg/kg of methylxanthines (theobromine plus caffeine), heart effects at 40–50 mg/kg and seizures at about 60 mg/kg.
Is white chocolate dangerous?
White chocolate has very little theobromine (about 0.25 mg/oz in the calculator), but its fat and sugar can still upset the stomach or trigger pancreatitis.
How long after eating chocolate do symptoms start?
Signs can take several hours to appear and may last a day or more, so call your vet before waiting for symptoms.
What should I do right now?
Note the type, amount and time eaten, keep the wrapper, and call your vet or a poison hotline. Never induce vomiting without a veterinarian's say-so.
Related calculators
Sources
Educational estimate from published toxicology references. Not veterinary advice. If in doubt, call your vet.