This chocolate toxicity calculator helps you and your veterinary team quickly estimate how much theobromine a dog has ingested and how serious the risk may be. Enter your dog’s weight, the type of chocolate, and the amount eaten to get an instant theobromine dose (mg/kg) and a colour-coded risk band.
Wondering “is chocolate toxic to dogs?” — yes, even small amounts of dark or baking chocolate can be dangerous. This dog chocolate calculator is a triage reference only and does not replace professional advice. If your dog has eaten chocolate, contact your veterinarian or a pet poison control line right away.
Important: This calculator is a decision-support reference and does not replace professional veterinary advice. If your dog has eaten chocolate, contact your veterinarian or a pet poison control line immediately. In an emergency, seek veterinary care without delay.
Chocolate contains theobromine, a methylxanthine stimulant. Dogs metabolise theobromine far more slowly than humans, so it accumulates and overstimulates the heart and nervous system. Chocolate also contains caffeine, but theobromine is the primary toxic principle, so this calculator bases the risk estimate on theobromine.
The estimated theobromine dose is calculated as: theobromine ingested (mg) = grams of chocolate eaten × theobromine content per gram; dose (mg/kg) = theobromine ingested ÷ your dog’s weight in kg. Weights and amounts are converted to metric internally (1 oz = 28.35 g; 1 lb = 0.4536 kg).
Signs typically appear 6 to 12 hours after ingestion and can last for days because theobromine clears slowly. The darker and more bitter the chocolate, the more theobromine it contains — which is why dark and baking chocolate are far more dangerous than milk or white chocolate.
| Chocolate type | Theobromine (mg per gram) |
|---|---|
| White chocolate | 0.1 |
| Milk chocolate | 2 |
| Dark / semi-sweet chocolate | 5.5 |
| Baking / unsweetened chocolate | 16 |
| Cocoa powder | 20 |
| Dry cocoa beans / mulch | 26 |
Toxicity depends on the dog’s weight, the chocolate type and the amount eaten. As a rough guide, signs of poisoning often start around 20 mg/kg of theobromine, cardiac effects around 40–60 mg/kg, and doses above 60 mg/kg can cause seizures. Even a small amount of dark or baking chocolate can be dangerous for a small dog. Use the calculator above for an estimate, then call your vet.
Stay calm and act quickly. Note the type of chocolate, the amount eaten and the time. Contact your veterinarian or a pet poison control line immediately, even if your dog seems fine — signs can take 6–12 hours to appear. Do not wait for symptoms before seeking advice.
Yes, chocolate is toxic to dogs. The danger rises with theobromine content: dry cocoa and baking/unsweetened chocolate are the most dangerous, followed by dark/semi-sweet, then milk chocolate. White chocolate has very little theobromine but its fat and sugar can still cause stomach upset or pancreatitis.
Signs usually appear within 6 to 12 hours of ingestion and can persist for up to 72 hours because dogs clear theobromine slowly. Early signs include vomiting, diarrhoea, restlessness and increased thirst, progressing to a racing heart, tremors and seizures in serious cases.
Common signs include vomiting, diarrhoea, excessive thirst, panting, restlessness, a rapid or irregular heartbeat, high blood pressure, muscle tremors and, in severe cases, seizures. Seek veterinary care as soon as you notice any of these.
It can, particularly with very dark or baking chocolate and small dogs. Doses of theobromine at or above roughly 100 mg/kg can be life-threatening. Never assume a small amount is safe — estimate the dose and contact your veterinarian or a pet poison line right away.
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