Dog Chocolate Toxicity Calculator
If your dog just ate chocolate, this calculator helps you quickly estimate the theobromine dose and toxicity risk. Theobromine is the compound in chocolate that is toxic to dogs because they metabolize it much more slowly than humans do.
Chocolate toxicity in dogs depends on three things: the type of chocolate, the amount eaten, and the dog's body weight. Dark and baker's chocolate are far more dangerous than milk chocolate because they contain much higher concentrations of theobromine.
Theobromine content by chocolate type (approximate):
- White chocolate: 0.04 mg/g (practically non-toxic, but the fat and sugar can still cause pancreatitis)
- Milk chocolate: 2.1 mg/g (about 64 mg per ounce)
- Semi-sweet/dark chocolate: 5.3 mg/g (about 150 mg per ounce)
- Baker's chocolate: 14 mg/g (about 390 mg per ounce)
- Cocoa powder: 26 mg/g (about 737 mg per ounce)
Toxicity thresholds by dose:
- Below 20 mg/kg: Mild or no symptoms expected
- 20-40 mg/kg: Mild toxicity (GI upset, restlessness)
- 40-60 mg/kg: Moderate toxicity (cardiac and neurological signs)
- Above 60 mg/kg: Severe toxicity (seizures, cardiac failure possible)
- 100-200 mg/kg: Potentially lethal
Symptoms typically appear within 6-12 hours of ingestion and can last 72 hours because theobromine has a long half-life in dogs (approximately 17.5 hours). Early signs include vomiting, diarrhea, excessive thirst, and restlessness. More serious signs include rapid breathing, muscle tremors, seizures, and abnormal heart rhythms.
When in doubt, always call your vet. You can also reach the ASPCA Animal Poison Control Center at 888-426-4435 (a consultation fee may apply).