Chocolate Toxicity Calculator for Dogs
Estimate whether the amount and type of chocolate your dog ate is dangerous — and what to do right now.
Last reviewed July 2026 · Educational tool · If in doubt, call a vet immediately
If your dog is having seizures, collapsing, or the dose is moderate or higher — call now, don't wait: ASPCA Poison Control (888) 426-4435 or Pet Poison Helpline (855) 764-7661, both 24/7.
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This is a guidance estimate, not a diagnosis. Individual sensitivity varies, and other ingredients (raisins, macadamia, xylitol) can compound the danger. When in doubt, call a poison line — it's what they're for.
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How chocolate poisoning works in dogs
Chocolate contains theobromine and caffeine — methylxanthines that dogs metabolize very slowly. They overstimulate the heart and nervous system, causing (in rising order of dose) vomiting and restlessness, then a racing or irregular heartbeat, then tremors and seizures. Darker chocolate is far more concentrated, which is why a few squares of baking chocolate can be an emergency for a dog that would shrug off the same weight of milk chocolate.
Frequently asked questions
My dog ate chocolate — what do I do?
First, call for help now — the ASPCA Animal Poison Control Center at (888) 426-4435 or the Pet Poison Helpline at (855) 764-7661, both 24/7. Use this calculator to gauge the dose while you dial. Have ready: your dog's weight, the type of chocolate, and how much was eaten. Don't wait for symptoms if the dose is moderate or higher.
How much chocolate is toxic to dogs?
It depends on the type and your dog's size. The toxic compound is theobromine (plus caffeine). Dark and baking chocolate are far more dangerous than milk chocolate — baking chocolate has roughly 7× the theobromine of milk. Signs begin around 20 mg/kg; 40–50 mg/kg affects the heart; 60+ risks seizures; over 100 mg/kg can be lethal.
Is white chocolate dangerous?
White chocolate has almost no theobromine (about 1 mg/oz), so theobromine poisoning is unlikely — but its fat and sugar can still cause vomiting, diarrhea, or pancreatitis. When in doubt, call a poison line.
What about cats?
Chocolate is toxic to cats too, though they rarely eat enough to matter since they can't taste sweetness. If your cat ate chocolate, treat it as seriously as with a dog and call your vet.
Chocolate dose thresholds per the Merck Veterinary Manual. This tool is educational and does not replace professional veterinary advice.
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