Dog Health
Chocolate Poisoning in Dogs: Symptoms, How Much Is Toxic & What to Do
Published Last updated 2 min read
Quick answer
Chocolate is toxic to dogs because of theobromine, which dogs metabolise slowly. Dark and baking chocolate are most dangerous; milk chocolate is less so but still risky in quantity. If your dog ate chocolate, call your vet or a pet poison line immediately with the type, amount, and your dog's weight — do not wait for symptoms.
Why is chocolate poisonous to dogs?
Chocolate contains theobromine and caffeine, both methylxanthines. Dogs break these down much more slowly than people, so theobromine builds up to toxic levels. The darker and more concentrated the chocolate, the more theobromine it contains.
Approximate theobromine content (general guide only — always confirm with your vet):
| Chocolate type | Relative risk |
|---|---|
| Baking / unsweetened chocolate | Highest |
| Dark chocolate (70%+) | High |
| Milk chocolate | Moderate |
| White chocolate | Very low theobromine (still not a treat) |
Symptoms of chocolate poisoning
Signs usually appear within 2–12 hours and may include:
- Vomiting and diarrhoea
- Restlessness or hyperactivity
- Increased thirst and urination
- Rapid heart rate or panting
- Muscle tremors or twitching
- Seizures (severe cases)
- Collapse
Severe poisoning can cause heart arrhythmias and, without treatment, can be fatal — especially in small dogs or after large amounts of dark chocolate.
What to do if your dog ate chocolate
- Call your vet or a pet poison helpline now — do not wait for symptoms.
- Tell them the type of chocolate, approximate amount, time eaten, and your dog's weight.
- Do not induce vomiting unless a vet instructs you to.
- Keep the wrapper if you have it — it helps estimate cocoa content.
If advised to go to the clinic, treatment may include induced vomiting (if recent), activated charcoal, IV fluids, heart monitoring, and anti-seizure medication.
Prevention
Keep all chocolate — including baking ingredients, advent calendars, and Easter eggs — out of reach. Remind guests and children that chocolate is not a dog treat. Xylitol-sweetened products are a separate, equally urgent poison risk.
Sources & further reading
Facts in this guide are rewritten in plain English from publicly available UK advice. We name the organisation where a specific point comes from their guidance. Links below go to the original pages — use them to read the source material directly.
PETHEALTH+ is independent. These organisations do not sponsor, approve, or partner with this website. Guidance checked against sources listed below (last updated 2026-06-23).
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Frequently Asked Questions
- How much chocolate will kill a dog?
- It depends on the dog's weight and the chocolate type — as little as 20 g of baking chocolate can be dangerous for a small dog. Never guess; call your vet or a poison line with the amount and type.
- How long after eating chocolate do symptoms appear?
- Usually within 2–12 hours, though mild signs can take longer. Do not wait for symptoms if you know chocolate was eaten.
- Is white chocolate toxic to dogs?
- White chocolate contains very little theobromine and is rarely toxic in small amounts, but high fat and sugar can still cause vomiting and pancreatitis.
- Can a dog recover from chocolate poisoning?
- Yes — with prompt treatment most dogs recover well. Severity depends on dose, type of chocolate, and how quickly treatment starts.