Dog Chocolate Toxicity Calculator
Check how risky the chocolate your dog ate is for its body weight.
About the Dog Chocolate Toxicity Calculator
Chocolate contains theobromine and caffeine (methylxanthines) that dogs eliminate slowly. The Merck Veterinary Manual reports mild signs from about 20 mg/kg, heart effects at 40–50 mg/kg and seizures from 60 mg/kg. Darker and baking chocolate are far more dangerous than milk chocolate; cocoa powder is the most concentrated.
The formula
Dose (mg/kg) = grams eaten × methylxanthines per gram ÷ dog's kg
Approximate methylxanthines (Merck Veterinary Manual)
| Type | mg per g | mg per oz |
|---|---|---|
| White chocolate | 0 | 0 |
| Milk chocolate | 2.3 | 65 |
| Semisweet / dark (50–60%) | 5.4 | 153 |
| Dark chocolate (70%+) | 10.8 | 308 |
| Unsweetened baking chocolate | 16 | 454 |
| Dry cocoa powder | 28.5 | 808 |
Worked example
Example: Low risk = 11 mg/kg
- Inputs: Weight in: lb; Dog's weight: 20; Type of chocolate: Milk chocolate; Amount eaten: 45 g.
- Formula: Dose (mg/kg) = grams eaten × methylxanthines per gram ÷ dog's kg
- Result: Low risk = 11 mg/kg
Things to keep in mind
- Content varies by brand and cocoa percentage, and some dogs are more sensitive. This is not a substitute for a vet: call your vet or an animal poison control line.
Questions people ask
What should I do right away?
Call your vet or a pet poison helpline; they may induce vomiting if it was eaten recently.
How soon do signs appear?
Usually within 6–12 hours.