Chapter 12Pets & Animals

Why is chocolate bad for dogs?

Chocolate contains theobromine, which dogs metabolize far more slowly than humans. Dark chocolate is worst; a bar of baking chocolate can be lethal to a small dog. Signs: vomiting, tremors, racing heart within hours.

Follow-up questions

How much is too much?

Roughly 100 mg theobromine per kg of dog. Milk chocolate: about 45g per 5kg dog is risky. When in doubt, call the vet.

Other foods that are toxic?

Grapes, raisins, xylitol (in sugar-free gum), onions, garlic, and macadamia nuts.

How much chocolate is dangerous for a dog?

Roughly 20 mg of theobromine per kg is mild, 40–50 mg/kg serious. Dark and baking chocolate are many times more toxic than milk chocolate.

What should I do if my dog ate chocolate?

Call a vet or pet poison line immediately with the dog's weight, chocolate type, and amount. Don't wait for symptoms.

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