Dog Chocolate Toxicity Calculator - Is It an Emergency?
Chocolate contains theobromine, and dogs clear it far more slowly than people do. Enter what your dog ate and get the dose in mg per kg of body weight, the risk level, and what to do next.
How to use this calculator
- Weigh your dog, or use the weight from their last vet visit. Enter it in kilograms; the pound equivalent shows under the field.
- Estimate the amount of chocolate eaten in grams. One square of a bar is about 5 g, a whole bar about 100 g.
- Pick the chocolate type. If you are not sure which it was, choose the darkest plausible option; darker chocolate carries more theobromine.
- Read the dose and the risk level. Anything in the mild-moderate band or above warrants a call to your veterinarian now.
How the estimate works
The calculator multiplies the amount of chocolate by its theobromine content per gram, then divides by your dog's body weight: dose (mg/kg) = grams × mg theobromine per gram ÷ weight in kg.
Approximate theobromine content per gram of chocolate
Source: USDA FoodData Central. Values are approximate and vary by brand.
| Chocolate type | Theobromine (mg per g) |
|---|---|
| White chocolate | 0.01 |
| Milk chocolate | 2.1 |
| Semisweet chocolate | 5.5 |
| Dark chocolate | 8 |
| Baking chocolate | 14 |
| Cocoa powder | 20.6 |
Risk bands by dose
Source: Merck Veterinary Manual thresholds for theobromine poisoning.
| Dose (mg per kg body weight) | Risk level | What to do |
|---|---|---|
| 0 to under 1 | Safe | No toxic dose reached. Keep an eye on your dog for the next few hours. |
| 1 to under 20 | Low | Below the level where signs usually appear. Watch for vomiting, diarrhea, or restlessness over the next 24 hours. |
| 20 to under 40 | Mild to moderate | Vomiting and diarrhea are possible at this dose. Call your veterinarian now. |
| 40 to under 60 | Severe | Dangerous dose. Contact an emergency veterinary clinic immediately. |
| 60 and above | Critical | This dose reaches the range where seizures and heart rhythm problems occur. Go to an emergency veterinary clinic immediately. |
Cocoa solids carry the theobromine, which is why baking chocolate and cocoa powder are the most dangerous: they are concentrated cocoa solids, so a small amount delivers a large dose. Milk and white chocolate are diluted with sugar, milk fat, and cocoa butter, so far larger amounts are needed to reach the same dose. If you do not know exactly what and how much your dog ate, assume the more dangerous option and call your veterinarian.
Frequently asked questions
Does this calculator keep a record of what I enter about my dog?
No. Your dog's weight and the chocolate amounts stay in your browser tab, where the theobromine math runs. Nothing is sent to a server, nothing is saved on our side, and nothing is written to your browser's storage. If you are working through a scare, those details are nobody else's business. The site sets no cookies and has no accounts; if an ad is shown, the ad network follows its own policies but still never receives what you typed.
How much chocolate is dangerous for a dog?
The Merck Veterinary Manual puts the first signs of theobromine poisoning at about 20 mg per kg of body weight, calls 40 to 50 mg/kg severe, and puts seizures in the range of 60 mg/kg and above. This calculator converts the chocolate your dog ate into that same mg per kg dose so you can see where it falls.
Which types of chocolate are worst for dogs?
The darker the chocolate, the more theobromine it carries per gram. Cocoa powder (about 20.6 mg per gram) and baking chocolate (about 14 mg per gram) carry several times more than milk chocolate (about 2.1 mg per gram). White chocolate has almost none (about 0.01 mg per gram). That is why a 50 g piece of baking chocolate is a severe dose for a 10 kg dog, while 100 g of milk chocolate on the same dog only reaches the mild-moderate band.
Where do the numbers come from?
Risk thresholds follow the Merck Veterinary Manual. The theobromine content per gram comes from USDA FoodData Central entries. Both are approximations: brands differ, and premium dark bars often carry more theobromine than the table value.
Is this calculator a diagnosis?
No. It is a screening estimate based on average theobromine values and published thresholds. Real exposures depend on the exact product, how much was actually eaten, and the dog's age and health. For any real exposure, contact a veterinarian immediately instead of waiting for symptoms.
What should I do if my dog just ate chocolate?
Note the chocolate type and the amount eaten, then call your veterinarian or the nearest emergency veterinary clinic. Do not wait for vomiting or restlessness to appear, and do not induce vomiting unless a veterinarian tells you to. Signs can take hours to show.