Food safety · 2 min read

Can cats eat Dark chocolate?

No — dangerous

No. Dark chocolate contains the highest concentration of theobromine of any common chocolate — even a small square is a genuine emergency for a cat.

If your cat has just eaten dark chocolate

  1. Note the percentage cocoa (70%, 85%, etc.) and weight eaten.
  2. Call your vet immediately — dark chocolate is the most urgent chocolate exposure.
  3. Do not try to make your cat vomit at home.
  4. If you can't reach your vet, call Animal PoisonLine (01202 509000) — paid triage, 24/7.
  5. Use our chocolate toxicity calculator for a quick severity estimate.

What's the full picture?

Dark chocolate (typically 70%+ cocoa solids) contains roughly 5–10mg of theobromine per gram. That makes it roughly 3–5 times more toxic per gram than milk chocolate. Premium dark chocolate (85%, 90%) is more concentrated still.

For a 4kg cat, toxic doses start around 4g of dark chocolate — less than a single square of a standard bar. Serious symptoms become likely above 8–10g.

Dark chocolate is found in adult confectionery, baking aisles, luxury chocolates, and chocolate liqueurs. Keep it locked away if you have chocolate-curious cats in the house.

Symptoms to watch for

2–4 hours
Vomiting, diarrhoea, restlessness, increased thirst.
6–12 hours
Tremors, rapid heart rate, elevated temperature.
12–36 hours
Seizures, cardiac arrhythmias, collapse in severe cases.

Hidden sources you might not think of

  • Baking chocolate and cooking chocolate
  • Cocoa powder (very concentrated)
  • Dark chocolate biscuits (Bournville, dark digestives)
  • Luxury chocolate boxes

Safer alternatives

  • Freeze-dried meat cat treats
🍫 Work out if the dose is toxic for your cat's weight
Open chocolate toxicity calculator →

Questions owners ask

My cat ate one square of 70% dark chocolate. How worried should I be?

One square is roughly 8–10g depending on the bar, which is enough to cause moderate toxicity in an average cat. Call your vet now — don't wait for symptoms.

If you're worried right now

Call your vet or out-of-hours emergency vet first. For poison advice, the Animal PoisonLine (UK) is on 01202 509000 — 24/7, charges apply. Your vet can also call the Veterinary Poisons Information Service (VPIS) directly.

Caffeine (coffee, tea, energy drinks) no Chocolate no Cocoa powder no Easter eggs no Milk chocolate no White chocolate caution

About this guidance

Every entry on this site is compiled from published UK veterinary toxicology sources — International Cat Care, Veterinary Poisons Information Service (VPIS) references, RCVS-registered practice materials, and peer-reviewed feline medicine literature. Where the evidence is mixed, we err on the cautious side because cats are unusually sensitive to many common substances that are harmless to humans and even to dogs.

This is general information written for UK cat owners. It is not personalised veterinary advice for your specific cat, their age, weight, medical history, or the exact exposure you're dealing with. If your cat has eaten something or is unwell, call your vet first. The Animal PoisonLine on 01202 509000 is available 24/7 for a small fee and can tell you whether an emergency visit is needed.

Entries are reviewed and updated as new research emerges. Spotted an error? Let us know — corrections are investigated and applied within 24 hours. For more context on how we work, see about and our full disclaimer.

Last reviewed: · By the What Can My Cat Eat? editorial team

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