Can dogs eat chocolate?
Chocolate contains theobromine and caffeine, which dogs process slowly. Darker chocolate is more dangerous. Even when the amount is small, call your vet or a poison control line to check whether your dog needs treatment.
Note the type of chocolate, how much was eaten and your dog’s weight, then call your vet or the ASPCA Animal Poison Control Center at (888) 426-4435 (a fee may apply). If it was eaten recently, a vet may be able to make your dog vomit safely — don’t try this at home unless a vet tells you to.
Why is chocolate toxic to dogs?
Chocolate is made from cacao seeds, which contain two stimulants called methylxanthines: theobromine and caffeine. Both are absorbed quickly and affect the heart and nervous system. Dogs clear theobromine very slowly — its half-life in dogs is about 17.5 hours — so the effects can last a long time.
Chocolate is also high in fat, which can trigger pancreatitis in some dogs, even when the amount of theobromine is low.
Which chocolate is most dangerous?
The more cacao, the more methylxanthines. From most to least dangerous:
| Type | Risk |
|---|---|
| Cocoa powder, unsweetened baking chocolate, cacao nibs | Highest — small amounts can be serious |
| Dark chocolate (the higher the % cocoa, the worse) | High |
| Milk chocolate | Lower, but larger amounts are still dangerous |
| White chocolate | Very little theobromine, but the fat can still upset the stomach |
Cocoa bean hull garden mulch can also contain methylxanthines and has poisoned dogs.
How much chocolate is too much?
According to the Merck Veterinary Manual, in dogs:
- mild signs (vomiting, diarrhea, increased thirst) may occur at about 20 mg of methylxanthines per kg of body weight;
- effects on the heart occur at about 40–50 mg/kg;
- seizures occur at 60 mg/kg or more.
An example, for illustration only: the Merck manual estimates a 65% cocoa bar contains about 10 mg of methylxanthines per gram. For a 10 kg (22 lb) dog, 20 mg/kg is 200 mg — roughly 20 g of that chocolate, about two squares of a typical bar. Individual dogs vary, and some react to less, so always call rather than calculate.
Signs of chocolate poisoning
Signs usually appear within 6–12 hours and may include:
- Vomiting and diarrhea
- Drinking a lot of water
- Restlessness, hyperactivity or panting
- A racing heart or abnormal heart rhythm
- Tremors or seizures in severe cases
How to prevent it
- Store chocolate, cocoa and baking supplies in closed cupboards — not in bags on the floor.
- Be extra careful around holidays, when there’s more chocolate around the house.
- Check treats, cakes and cookies for chocolate before sharing anything.
Frequently asked questions
My dog ate a small piece of milk chocolate. Is that an emergency?
It depends on your dog’s weight and the exact amount. A small piece of milk chocolate is often less serious for a large dog, but don’t guess — call your vet or a poison control line with the details and they’ll tell you whether to come in.
Is white chocolate safe for dogs?
It contains very little theobromine, so it’s much less likely to cause chocolate poisoning, but it’s high in fat and sugar and can still cause stomach upset or pancreatitis. It isn’t a good treat.
Can cats get chocolate poisoning too?
Yes. Cats are also sensitive to theobromine. They rarely eat chocolate because they can’t taste sweetness, but if your cat does, call your vet.
This article is general information, not veterinary advice. Every pet is different — for questions about your own pet’s health, talk to your veterinarian.
