Chocolate Toxicity Calculator for Dogs

Get help immediately for emergency signs

If your dog is trembling, having a seizure, or has collapsed, seek emergency veterinary help immediately. Do not wait to use this calculator.

Keep the packaging. Contact your veterinarian or ASPCA Poison Control at (888) 426-4435.

Source: ASPCA — What to Do If Your Pet Gets into Chocolate. Last checked: October 22, 2026.

Enter the exposure details

Estimated risk

How the estimate works

Estimated dose (mg/kg) =
amount eaten (oz) × methylxanthines (mg/oz) ÷ body weight (kg).

For cocoa percentage mode:

Estimated concentration (mg/g) = 15.5 × cocoa percentage ÷ 100.

Estimated dose (mg/kg) =
amount eaten (g) × estimated concentration (mg/g) ÷ body weight (kg).

Merck's example gives a 65% cocoa chocolate an estimated concentration of approximately 10.1 mg/g. This is an estimate; ingredients, cocoa sources, recipes, and brands can produce different actual concentrations.

The semisweet / sweet dark chocolate reference remains a range. The later calculator implementation will use the upper end of that range for risk-band display. This is this site's conservative display rule, not an exact laboratory measurement of a particular brand.

Source for the percentage method, 65% example, and variation among products: Merck Veterinary Manual — Chocolate Toxicosis in Animals. Full review: September 2024. Last updated: February 2026. Last checked: October 22, 2026.

Methylxanthine reference values

These values represent total methylxanthines (theobromine plus caffeine).

Source: Merck Veterinary Manual — Chocolate Toxicosis in Animals. Full review: September 2024. Last updated: February 2026. Last checked: October 22, 2026.

Cocoa bean hulls and mulch are outside this food calculator's scope for a dog that has eaten chocolate, so they are not offered as an input.

Reference doses

• At 20 mg/kg, mild signs may occur.
• At 40–50 mg/kg, cardiac toxicity may occur.
• At 60 mg/kg or more, seizures may occur.

These reference doses are not individual diagnostic boundaries.

Source: Merck Veterinary Manual — Chocolate Toxicosis in Animals. Full review: September 2024. Last updated: February 2026. Last checked: October 22, 2026.

Unit conversions

• 1 lb = 0.45359237 kg
• 1 oz = 28.349523125 g

Source: NIST — Handbook 133, 2011. Last checked: October 22, 2026.

Other ingredients change the risk

• Sugar-free chocolate: It may contain xylitol, which can cause low blood sugar and liver damage. If xylitol is suspected, contact a veterinarian immediately. This calculator does not assess xylitol.

  Sources: ASPCA — What to Do If Your Pet Gets into Chocolate; ASPCA — People Foods to Avoid Feeding Your Pets. Last checked: October 22, 2026.

• Raisins or grapes: They may cause kidney damage. Tell your veterinarian immediately; do not act only on the chocolate calculation.

  Source: ASPCA — People Foods to Avoid Feeding Your Pets. Last checked: October 22, 2026.

• White chocolate: It contains very little theobromine, but its fat and sugar may still cause gastrointestinal problems, including pancreatitis.

  Source: ASPCA — What to Do If Your Pet Gets into Chocolate. Last checked: October 22, 2026.