- Dark & baking chocolate are dangerous in small amounts
- Signs in 6–12 h
- Affects: Heart & nervous system
Chocolate is one of the most common causes of dog poisoning. It contains theobromine and caffeine — stimulants that humans process quickly but dogs break down very slowly. That slow metabolism lets these compounds build up to toxic levels, affecting the heart, nervous system and kidneys.
Why chocolate is dangerous for dogs
The darker and more bitter the chocolate, the more theobromine it contains. Baking chocolate and cocoa powder are the most concentrated, while milk and white chocolate contain less — but no chocolate is safe. The toxic dose depends on your dog's weight and the type of chocolate eaten.
- White chocolate: very low theobromine, but high fat and sugar.
- Milk chocolate: moderate risk — dangerous in larger amounts.
- Dark chocolate: high risk, even in small pieces.
- Baking chocolate / cocoa: extreme risk — the most toxic form.
How much chocolate is dangerous?
Danger depends on the type and your dog's size. Baking and dark chocolate are the most dangerous, milk chocolate less so, and white chocolate has almost no theobromine. As a rough guide, signs can begin around 20 mg of theobromine per kg of body weight — that can be just a few squares of dark chocolate for a small dog. Use our chocolate toxicity calculator to estimate the risk for your dog.
Symptoms of chocolate poisoning
Signs usually appear within 6–12 hours and may include vomiting, diarrhea, restlessness, rapid breathing, increased heart rate, muscle tremors and, in severe cases, seizures. Symptoms can last for days because theobromine clears the body so slowly.
⚠ If your dog ate chocolate
Act immediately — don't wait for symptoms.
- Call your vet or a pet poison helpline right away.
- Note the type of chocolate, the amount, and when it was eaten.
- Estimate your dog's weight — it determines how serious the dose is.
- Do not induce vomiting unless a professional tells you to.
Frequently asked questions
How much chocolate is toxic to a dog?
Toxic effects can begin around 20 mg of theobromine per kg of body weight. For a small dog, as little as 25 g of dark chocolate may be dangerous. Always treat any amount as a potential emergency.
My dog ate a tiny bit of milk chocolate — is it okay?
A very small amount of milk chocolate may not cause serious harm in a large dog, but you should still call your vet for advice based on your dog's weight and the exact amount.
How long does chocolate poisoning last?
Because dogs clear theobromine slowly, symptoms can last 24–72 hours. Veterinary monitoring is often recommended.