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Dog Chocolate Toxicity Calculator

Whether chocolate is dangerous depends on the type, how much your dog ate and your dog’s weight. Enter those three things to see the dose in mg/kg and which risk band it falls in. If your dog ate chocolate recently, don’t wait: call your vet or the ASPCA Animal Poison Control Center at (888) 426-4435.

By Sikander Malik · Updated October 17, 2026 · Sources

Type of chocolate

For very dark chocolate (70% cacao or more), choose Very dark, or Unsweetened if you’re not sure.

oz
lb
If the product also has xylitol (sugar-free), raisins or macadamia nuts, call your vet or the ASPCA now, whatever this result says. Those are dangerous on their own.

Estimated dose

14.1mg/kg of theobromine + caffeine

Below the usual toxic dose

Below the usual toxic dose. Puppies, small dogs and dogs with heart problems can react at lower amounts, so call your vet or the ASPCA to confirm.

Chocolate eaten57 g (128 mg total)
Thresholds (mg/kg)upset 20, heart 40, seizures 60

Call your vet or the ASPCA Animal Poison Control Center at (888) 426-4435 (a consultation fee may apply).

Don’t make your dog vomit at home unless a vet tells you to.

An estimate, not veterinary advice. Reviewed against the Merck Veterinary Manual chocolate toxicosis data and USDA FoodData Central, October 2026. Medical disclaimer.

When in doubt, call

If you are not sure what your dog ate or how much, or your dog is unwell, call your vet or the ASPCA Animal Poison Control Center at (888) 426-4435 (a fee may apply), or your nearest emergency vet. It is always better to call early.

How much chocolate is toxic to a dog?

It depends on the type of chocolate (how much theobromine and caffeine it holds), the amount eaten, and your dog’s weight. Vets use the dose in milligrams of theobromine plus caffeine per kilogram of body weight. Based on the Merck Veterinary Manual and the ASPCA: mild signs (vomiting, diarrhoea, thirst) appear around 20 mg/kg, heart effects around 40 to 50 mg/kg, and seizures at 60 mg/kg and above. The calculator does this maths for you and shows which band you are in.

Theobromine plus caffeine by chocolate type
Methylxanthine content by chocolate type
TypePer ouncePer gram
White chocolate1.1 mg0.04 mg
Milk chocolate64 mg2.3 mg
Semisweet / sweet dark160 mg5.6 mg
Very dark (70%+ cacao)250 mg8.82 mg
Unsweetened (baker's)440 mg15.5 mg
Cocoa powder807 mg28.5 mg
Darker chocolate and cocoa powder hold far more than milk chocolate, so a small amount matters more. White chocolate has very little, but is high in fat and sugar.
Content from the Merck Veterinary Manual (high end of each range); very dark (70%+) from USDA FoodData Central.

What to do if your dog ate chocolate

  • Act early. If it was eaten in the last 1 to 2 hours, call now. Your vet may be able to make your dog vomit before the chocolate is absorbed.
  • Don’t make your dog vomit at home unless a vet tells you to. The wrong method can do more harm.
  • Check the label. If the product also has xylitol (sugar-free), raisins or macadamia nuts, call your vet or the ASPCA whatever the chocolate result says. Those are dangerous on their own.
  • Save the wrapper so you and your vet know the type and amount.
  • Watch for signs: restlessness, a racing heart, vomiting, diarrhoea, tremors or seizures. Call your vet or the ASPCA Animal Poison Control Center at (888) 426-4435.

Questions owners ask

How much chocolate is toxic to a dog?
It depends on the type and your dog’s weight. Vets use the dose of theobromine plus caffeine per kilogram: mild signs appear around 20 mg/kg, heart effects around 40 to 50 mg/kg, and seizures at 60 mg/kg and up. Milk chocolate holds about 64 mg per ounce, dark far more, and baking chocolate and cocoa powder the most. The calculator works out the dose for you.
My dog ate a small piece of milk chocolate, is that an emergency?
Often a small amount of milk chocolate for a medium or large dog lands below the usual toxic dose, but this tool never calls it safe. Puppies, small dogs and dogs with heart conditions can react at lower amounts. Enter the details, and if you are unsure or your dog seems unwell, call your vet or the ASPCA.
How soon do symptoms show?
Signs usually start within 6 to 12 hours and can last a day or more because theobromine leaves a dog’s body slowly. Early signs include restlessness, a racing heart, vomiting, diarrhoea and increased thirst; more serious signs are tremors and seizures. If it was eaten in the last 1 to 2 hours, call your vet now, as they may be able to make your dog vomit.
Should I make my dog throw up?
Not at home, unless a vet tells you to. Doing it the wrong way, or at the wrong time, can harm your dog. Call your vet or the ASPCA Animal Poison Control Center at (888) 426-4435 first; they will tell you whether to come in and what to do.
Is white chocolate safe for dogs?
White chocolate has very little theobromine, so it rarely reaches a toxic dose, but it is not a treat for dogs: it is high in fat and sugar, which can upset the stomach or trigger pancreatitis. And some sweets contain xylitol, which is very dangerous. When in doubt, ask your vet.
What about xylitol, raisins or nuts in the chocolate?
Those are dangerous on their own. Xylitol (in sugar-free chocolate) can cause a drop in blood sugar and liver damage, raisins can cause kidney failure, and macadamia nuts cause weakness and tremors. If the product contains any of them, call your vet or the ASPCA whatever the chocolate result says.

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Sources

An estimate, not veterinary advice. Reviewed against the Merck Veterinary Manual chocolate toxicosis data and USDA FoodData Central, October 2026. Medical disclaimer.