How Much Chocolate Is Toxic to Dogs? Chart by Weight and Type
Published by MaunaPet. Editorial policy and sources.
If your dog has just eaten chocolate: call your vet or an emergency clinic now, especially for dark or baking chocolate, cocoa powder or an unknown amount. Do not wait for symptoms and do not induce vomiting unless a vet tells you to.
Chocolate is toxic to dogs because of two methylxanthines, theobromine and caffeine. The risk depends on three things: the dog's weight, the type of chocolate and the amount eaten. The darker the chocolate, the less it takes.
The dose thresholds vets use
According to the Merck Veterinary Manual, the dose of methylxanthines per kilogram of body weight predicts the signs:
| Dose | Expected effect |
|---|---|
| About 20 mg/kg | Mild signs may occur: vomiting, diarrhoea, increased thirst |
| 40–50 mg/kg | Effects on the heart: fast or irregular heartbeat |
| 60 mg/kg and above | Seizures |
Sensitivity varies between dogs, and severe signs can occur at lower doses, so these are guides and not safe limits.
How much methylxanthine each chocolate contains
| Chocolate type | Methylxanthines per gram | Per ounce |
|---|---|---|
| White chocolate | 0.04 mg | 1.1 mg |
| Milk chocolate | 2.3 mg | 64 mg |
| Semisweet and sweet dark chocolate | 5.3–5.6 mg | 150–160 mg |
| Unsweetened baking chocolate | 15.5 mg | 440 mg |
| Cocoa powder | 28.5 mg | 807 mg |
Chart: amount that reaches 20 mg/kg, by dog weight
These are the amounts at which mild signs may start. Double them for the 40 mg/kg level and triple them for 60 mg/kg.
| Dog weight | Milk chocolate | Dark chocolate | Baking chocolate | Cocoa powder |
|---|---|---|---|---|
| 3 kg (7 lb) | 26 g (0.9 oz) | 11 g (0.4 oz) | 3.9 g (0.1 oz) | 2.1 g (0.1 oz) |
| 5 kg (11 lb) | 43 g (1.5 oz) | 18 g (0.6 oz) | 6.5 g (0.2 oz) | 3.5 g (0.1 oz) |
| 10 kg (22 lb) | 87 g (3.1 oz) | 36 g (1.3 oz) | 13 g (0.5 oz) | 7 g (0.2 oz) |
| 20 kg (44 lb) | 174 g (6.1 oz) | 73 g (2.6 oz) | 26 g (0.9 oz) | 14 g (0.5 oz) |
| 30 kg (66 lb) | 261 g (9.2 oz) | 109 g (3.8 oz) | 39 g (1.4 oz) | 21 g (0.7 oz) |
| 40 kg (88 lb) | 348 g (12.3 oz) | 145 g (5.1 oz) | 52 g (1.8 oz) | 28 g (1 oz) |
For scale, a standard milk chocolate bar weighs about 43 g (1.5 oz).
Symptoms and when they appear
Signs usually appear within 6–12 hours of eating chocolate. Early signs include increased thirst, vomiting, diarrhoea, a swollen belly and restlessness. They can progress to hyperactivity, frequent urination, wobbliness, tremors and seizures, with a fast or irregular heartbeat. Theobromine leaves a dog's body slowly, so signs can last for days.
What to do
- Remove the rest and check whether other pets had access.
- Note the type of chocolate, the amount, the time and your dog's weight.
- Call your vet or an emergency clinic. In the United States you can also call ASPCA Poison Control on (888) 426-4435.
- Do not induce vomiting or give home remedies unless a vet instructs you.
- Keep the wrapper for the ingredient list and cocoa percentage.
Other dangers hiding in chocolate
- Fat and sugar: even white chocolate, which has almost no methylxanthines, can upset the stomach and may trigger pancreatitis.
- Xylitol in sugar-free chocolate causes a sudden drop in blood sugar.
- Raisins and macadamia nuts are toxic to dogs in their own right.
- Wrappers can block the gut.
For other foods, check the Can Dogs Eat? food safety guide, and keep an emergency plan ready: how to prepare for a pet emergency.
Frequently asked questions
How much chocolate is toxic to a dog?
Mild signs may occur from about 20 mg of methylxanthines per kg of body weight. For a 10 kg dog that is roughly 87 g (3.1 oz) of milk chocolate, 36 g (1.3 oz) of dark chocolate or 13 g (0.5 oz) of unsweetened baking chocolate. Heart effects start at 40–50 mg/kg and seizures at 60 mg/kg.
My large dog ate a small milk chocolate bar. Is it dangerous?
A standard 43 g milk chocolate bar gives a 30 kg dog about 3.3 mg/kg of methylxanthines, well below the 20 mg/kg level where mild signs may start. Stomach upset is still possible. Call your vet if your dog is small, the chocolate was dark, or you are unsure of the amount.
How long after eating chocolate will a dog get sick?
Signs usually appear within 6–12 hours. Because theobromine is cleared slowly, they can last for days. Call your vet straight away instead of waiting to see whether symptoms develop.
Is white chocolate toxic to dogs?
White chocolate contains almost no methylxanthines, about 0.04 mg per gram, so poisoning is unlikely. Its fat and sugar can still cause vomiting and diarrhoea and may trigger pancreatitis.
Sources and further reading
- Merck Veterinary Manual — Chocolate Toxicosis in Animals
- ASPCA Poison Control — People Foods to Avoid Feeding Your Pets
Links checked on November 12, 2026. These sources support the topic; they do not certify this entire article. Consult your veterinarian for diagnosis and treatment.