Dog ate chocolate: what to do now
- Remove any remaining chocolate and keep the wrapper, so you know the type and weight.
- Work out roughly how much your dog ate and when, and enter it above.
- Call your vet or an emergency vet clinic. In the US you can also call the ASPCA Animal Poison Control Center at (888) 426-4435 or the Pet Poison Helpline at (855) 764-7661 (both may charge a fee).
- Don't make your dog vomit at home unless a vet tells you to. Salt, mustard and some home remedies are dangerous, and hydrogen peroxide is only safe when a vet confirms it.
If your dog ate chocolate within the last 1 to 2 hours, a vet can often make it vomit safely and give activated charcoal, which stops much of the poison from being absorbed. That's why calling quickly matters more than waiting for signs.
Why chocolate is toxic to dogs
Chocolate contains theobromine and smaller amounts of caffeine, chemicals called methylxanthines. People break them down quickly, but dogs take many hours, so the chemicals build up and overstimulate the heart and nervous system. The darker and more bitter the chocolate, the more theobromine it contains.
How much chocolate is toxic to a dog?
The risk depends on the dose: milligrams of theobromine and caffeine per kilogram of your dog's body weight. According to the Merck Veterinary Manual:
| Dose | Typical signs |
|---|---|
| About 20 mg/kg | Mild: vomiting, diarrhea, thirst, restlessness |
| 40–50 mg/kg | Severe: racing or irregular heartbeat, high blood pressure |
| 60 mg/kg and above | Tremors and seizures; can be fatal |
Dose (mg/kg) = amount eaten × theobromine and caffeine per unit ÷ dog's weight in kg
Theobromine and caffeine content by type of chocolate
| Chocolate | mg per oz | mg per 100 g |
|---|---|---|
| White chocolate | ≈ 1 | ≈ 4 |
| Milk chocolate | ≈ 64 | ≈ 225 |
| Semisweet / sweet dark | ≈ 150–160 | ≈ 530–565 |
| Dark chocolate, 70–85% cocoa | ≈ 250 (our estimate) | ≈ 880 |
| Cocoa bean mulch | ≈ 255 | ≈ 900 |
| Unsweetened baking chocolate | ≈ 450 | ≈ 1,590 |
| Dry cocoa powder | ≈ 800 | ≈ 2,820 |
Values are from the Merck Veterinary Manual, except high-cocoa dark chocolate, which isn't listed there; for that we use an estimate based on published lab analyses of 70–85% bars. Real products vary, so the calculator uses figures near the top of each range to be on the safe side.
Worked example: a 30 lb (13.6 kg) dog eats 2 oz of 70% dark chocolate. 2 × 250 = 500 mg, and 500 ÷ 13.6 = 37 mg/kg, which is close to the level where heart problems start. That dog needs to see a vet. The same dog eating 2 oz of milk chocolate gets 128 mg, or 9 mg/kg: an upset stomach is possible, but serious poisoning is unlikely.
Signs of chocolate poisoning and when they start
Signs usually appear 6 to 12 hours after eating and can last up to three days, because dogs clear theobromine slowly. Watch for:
- Vomiting (sometimes with a chocolate smell) and diarrhea
- Drinking and urinating more than usual
- Restlessness, panting, hyperactivity
- A racing heart, tremors, stiffness or seizures in serious cases
The high fat in chocolate can also trigger pancreatitis a day or more later, even after a "safe" amount, especially in small dogs. Watch for a painful belly, hunching or refusal to eat.
Other ingredients to check on the wrapper
- Xylitol (birch sugar), used in some sugar-free chocolate and sweets, is extremely dangerous to dogs even in small amounts.
- Raisins can cause kidney failure in some dogs.
- Macadamia nuts cause weakness and tremors.
- Coffee beans in chocolate add a lot of caffeine.
If any of these are in what your dog ate, call your vet regardless of the result above.
Frequently asked questions
How much chocolate can kill a dog?
Fatal cases are uncommon and usually involve high doses, often quoted as 100–200 mg/kg of theobromine and caffeine, but seizures can start around 60 mg/kg. For a 20 lb dog, 60 mg/kg is roughly 1 oz of baking chocolate or about 8.5 oz of milk chocolate. Use the calculator for your dog's weight.
My dog ate one chocolate chip or M&M. Is that dangerous?
For most dogs, one or two pieces is far below the toxic dose. The exception is a very small dog eating dark or baking chocolate. Watch for vomiting or restlessness, and call your vet if you're unsure.
Is white chocolate toxic to dogs?
White chocolate has almost no theobromine, so poisoning is very unlikely. The fat and sugar can still cause vomiting, diarrhea or pancreatitis, so large amounts are still worth a call to the vet.
How long after eating chocolate will a dog get sick?
Signs usually start within 6 to 12 hours and can last up to 72 hours. Don't wait for signs: if the dose is significant, a vet can make your dog vomit within the first couple of hours and stop much of the poison being absorbed.
Is chocolate toxic to cats too?
Yes. Cats are just as sensitive to theobromine. Most cats aren't interested in sweet food, so poisoning is less common, but the same doses apply. Call your vet if your cat ate chocolate.
This calculator gives a rough estimate only and is not a diagnosis. Chocolate products vary, and individual dogs react differently. If your dog ate chocolate, contact a veterinarian or animal poison control for advice.