Suspect poisoning? US: ASPCA Poison Control (888) 426-4435 · UK: 01202 509 000 · Severe symptoms → nearest emergency vet now.
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My cat ate half a square of dark chocolate, should I be worried?

Cats · Food safety

Last reviewed: 2026-09-05 · Reference ranges: ASPCA, Pet Poison Helpline & Merck Veterinary Manual

Short answer

Yes, this is an urgent situation. Dark chocolate is highly toxic to cats due to its theobromine and caffeine content, which can quickly cause vomiting, tremors, or heart issues. Do not wait for symptoms to appear. Contact your veterinarian or the ASPCA Animal Poison Control Center at 888-426-4435 immediately.

Chocolate — Food safety facts

Do not feed · Cats · full breakdown on the linked food page

Toxic. Theobromine and caffeine cause vomiting, tremors, seizures and heart problems. Dark and baking chocolate are worst.

Open the full food page: Chocolate food facts →

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