If your dog ate baking chocolate or cocoa powder, or ate any chocolate and is now restless, vomiting, panting or shaking, call your veterinarian or an animal poison control line now. Do not wait for symptoms to get worse and do not induce vomiting without being told to.
For everything else, the risk comes down to one number: milligrams of theobromine per kilogram of your dog's body weight. Below about 20 mg/kg most dogs stay fine, 20 to 40 mg/kg usually brings restlessness and stomach upset, and above 40 mg/kg is an emergency. Run the exact numbers in the chocolate toxicity calculator.
Why the type of chocolate matters more than the amount
Theobromine is the compound dogs cannot clear efficiently, and its concentration varies enormously by product. Values below follow the Merck Veterinary Manual:
| Chocolate type | Theobromine | Relative danger |
|---|---|---|
| White chocolate | negligible | Fat and sugar risk only |
| Milk chocolate | 2.4 mg per gram | Moderate |
| Dark and semi-sweet chips | 5.5 mg per gram | High |
| Unsweetened baking chocolate | 16 mg per gram | Very high |
| Dry cocoa powder | 26 mg per gram | Highest |
Cocoa powder carries roughly eleven times the theobromine of milk chocolate gram for gram. A dog can eat a whole milk chocolate bar and be uncomfortable, while a fraction of that weight in baking chocolate is a hospital visit.
Thresholds for a 30 lb dog
A 30 lb dog is about 13.6 kg. Here is where each threshold falls:
| Chocolate type | Symptoms likely (20 mg/kg) | Emergency (40 mg/kg) |
|---|---|---|
| Milk chocolate | 4.0 oz | 8.0 oz |
| Dark or semi-sweet | 1.7 oz | 3.5 oz |
| Baking chocolate | 0.6 oz | 1.2 oz |
| Cocoa powder | 0.4 oz | 0.7 oz |
Scale it by weight: a 15 lb dog hits the same thresholds at half those amounts, a 60 lb dog at double. That is why body weight is the first question a vet asks.
What to do in the first ten minutes
- Get the wrapper. The type and the total weight in ounces or grams are the two facts that decide everything. A 3.5 oz bar of 70 percent dark is a completely different event from a 3.5 oz bar of milk chocolate.
- Weigh the dose. Use the calculator or the tables above. Assume the dog ate all of what is missing.
- Note the time. Signs usually begin within 6 to 12 hours, and treatment is far easier before absorption than after.
- Call, do not wait. Your vet, an emergency clinic, or a poison control line. In the US, the ASPCA Animal Poison Control Center (888 426 4435) and the Pet Poison Helpline (855 764 7661) run around the clock; both charge a consultation fee.
Signs to watch for
- Early, mild: restlessness, thirst, vomiting, diarrhea, a bloated belly.
- Moderate: pacing, panting, a racing heartbeat, muscle tremors.
- Severe: stiffness, collapse, seizures. This stage is life threatening and needs a clinic immediately.
Theobromine has a long half-life in dogs, so signs can persist for a day or more after a large dose. A dog that seems fine four hours in is not yet in the clear if the dose was high.
What makes it worse
- Small dogs. The same square of dark chocolate is a fifth of the dose for a 50 lb dog and a full dose for a 10 lb one.
- Heart conditions or epilepsy. Theobromine stresses exactly those systems, so the usual thresholds are not a safe guide.
- The wrapper and the fat. Foil, plastic and a big slug of fat cause their own problems, from obstruction to pancreatitis, independent of theobromine.
- Sugar-free chocolate. Check for xylitol, listed as birch sugar on some labels. It is dangerous to dogs at far smaller amounts than theobromine and needs a vet call regardless of quantity.
FAQ
My dog ate one small piece of milk chocolate. Should I panic?
For a medium or large dog, a single small piece of milk chocolate is usually well under the symptom threshold. Watch for vomiting or restlessness over the next 12 hours. For a dog under 15 lb, run the numbers before deciding, because the margin is much thinner.
Is white chocolate safe?
It carries almost no theobromine, so it is not a poisoning risk in the usual sense, but it is still a large dose of fat and sugar that can trigger vomiting or pancreatitis.
Should I make my dog vomit?
Only if a veterinarian tells you to. Home remedies can cause more harm than the chocolate, and inducing vomiting is unsafe in a dog that is already unsteady or seizing.
How long until symptoms show?
Usually 6 to 12 hours after eating, sometimes sooner with a large dose. Because theobromine clears slowly, effects can last well beyond 24 hours.
How is the risk calculated?
Grams eaten times the theobromine per gram for that type, divided by body weight in kilograms. The result in mg/kg is compared against the 20 and 40 thresholds. Sources are listed on the methodology page.
This page is an estimate for a healthy adult dog and is not veterinary advice. When in doubt, or with any puppy, senior or dog with a heart condition, call your veterinarian.