Dog Chocolate Toxicity Calculator
Enter your dog's weight, the type of chocolate, and how much was eaten. You get the theobromine dose against the Merck thresholds and what to do next. If in doubt, call a vet while you type.
a standard US candy bar is about 1.5 oz (43 g); a chocolate chip is ~1 g
Estimated theobromine dose
8.3 mg/kg
Below the usual threshold for signs
Watch for vomiting or restlessness for 24 hours; call your vet if any appear or if the amount is uncertain.
57 g of milk chocolate ≈ 113 mg theobromine ÷ 13.6 kg. ASPCA Animal Poison Control: (888) 426-4435. Pet Poison Helpline: (855) 764-7661.
Mild signs from
136.1 g
20 mg/kg -- vomiting, restlessness
Serious from
272.2 g
40 mg/kg -- racing heart, tremors
Seizure risk from
408.2 g
60 mg/kg
How much is dangerous, by dog weight
Grams of each chocolate type that reach the 20 mg/kg threshold where signs usually begin (Merck Veterinary Manual). For reference: a standard US candy bar is about 43 g, a chocolate chip about 1 g, a square of baking chocolate 28 g, a tablespoon of cocoa powder 5-6 g.
| Dog | Milk chocolate2 mg/g | Semisweet5.5 mg/g | Dark chocolate8 mg/g | Baking chocolate14 mg/g | Cocoa powder (dry, unsweetened; published range 14-26 mg/g, top used)26 mg/g |
|---|---|---|---|---|---|
| 10 lb | 45.4 g | 16.5 g | 11.3 g | 6.5 g | 3.5 g |
| 20 lb | 90.7 g | 33 g | 22.7 g | 13 g | 7 g |
| 30 lb | 136 g | 49.5 g | 34 g | 19.4 g | 10.5 g |
| 40 lb | 181 g | 66 g | 45.4 g | 25.9 g | 14 g |
| 60 lb | 272 g | 99 g | 68 g | 38.9 g | 20.9 g |
| 80 lb | 363 g | 132 g | 90.7 g | 51.8 g | 27.9 g |
Double these amounts for the 40 mg/kg level (heart effects), triple for 60 mg/kg (seizure risk). Theobromine content varies by brand within each type, so treat the table as a guide to urgency, not a safe limit.
The thresholds behind the calculator
| Theobromine dose | Expected effect | Action |
|---|---|---|
| under 20 mg/kg | Usually no signs, or mild stomach upset | Watch for 24 hours; call if signs appear or the amount is uncertain |
| 20-40 mg/kg | Vomiting, diarrhoea, restlessness, thirst | Call a vet or poison line now; vomiting may be induced under guidance |
| 40-60 mg/kg | Racing or irregular heartbeat, tremors, high temperature | Go to a vet or emergency clinic |
| 60+ mg/kg | Seizures possible; LD50 is around 100-200 mg/kg | Emergency vet immediately |
Caffeine in chocolate adds to the effect and the calculator does not count it, which makes the estimate slightly optimistic; a dog on the borderline should be treated as over it. Small dogs, old dogs, and dogs with heart conditions have less margin at every level.
What the vet will do
Within a couple of hours of ingestion: induce vomiting and give activated charcoal to bind what is left. After that: IV fluids to speed clearance, medication for a racing heart or tremors, and monitoring, sometimes overnight. Most dogs seen early do well; the dangerous cases are the big doses found late. If you know the wrapper, bring it -- the label gives the vet the cocoa percentage and weight without guesswork.
Frequently Asked Questions
My dog ate chocolate. What do I do right now?
Work out roughly what kind and how much, weigh or estimate the dog, and run the numbers above. If the dose is 20 mg/kg or more -- or you are not sure of the amount -- call your vet, the ASPCA Animal Poison Control Center (888-426-4435) or the Pet Poison Helpline (855-764-7661) now; they are open 24 hours and will tell you whether to come in. Do not induce vomiting at home unless a vet tells you how; it is most useful within 1-2 hours of ingestion.
Why is dark chocolate so much worse than milk?
Theobromine is in the cocoa solids. Milk chocolate is mostly sugar and milk with 10-30% cocoa; dark is 60-85%; baking chocolate and cocoa powder are nearly all cocoa. Gram for gram, baking chocolate carries about 7 times the theobromine of milk chocolate, so a piece a dog could shrug off as a candy bar becomes an emergency as a brownie ingredient.
What are the symptoms and when do they start?
Vomiting, diarrhoea, restlessness and excessive drinking and urination usually within 6-12 hours; at higher doses a racing heart, tremors, high temperature and, above about 60 mg/kg, seizures. Theobromine is cleared slowly in dogs -- a half-life of about 17 hours -- so signs can last 2-3 days and a dog that seems fine at hour 4 can be in trouble at hour 12.
Is white chocolate safe?
Essentially, from theobromine -- it contains almost none. The fat and sugar can still cause vomiting or pancreatitis in a large amount, and the wrapper can cause an obstruction, but it is not a poisoning risk.
What about cats?
Cats are at least as sensitive as dogs, but rarely eat chocolate because they cannot taste sweetness. The same mg/kg thresholds apply; a cat's small body weight means even a little is a lot. Call a vet.
These calculators use published veterinary formulas and are for general guidance. They are not a diagnosis and do not replace your veterinarian, who knows your animal's breed, history, and body condition.