Chocolate Toxicity Calculator for Dogs (Theobromine + Caffeine mg/kg)
Methylxanthine dose (theobromine + caffeine) in mg/kg from the type and amount of chocolate eaten, with the expected clinical signs.
Results are calculated in your browser. Always double-check before administering and use your clinical judgement.
How it is calculated
Methylxanthines (mg/kg) = amount eaten (g) × content (mg/g) ÷ body weight (kg). Content per gram: cocoa powder 28.5, unsweetened (baker's) 15.5, semisweet and sweet dark 5.3–5.6, milk 2.3, white 0.04 mg/g [1].
In dogs, mild signs (vomiting, diarrhoea, polydipsia) may occur at 20 mg/kg, cardiotoxic effects at 40–50 mg/kg and seizures at ≥ 60 mg/kg [1].
Worked example
100 g milk chocolate in a 10 kg dog = 230 mg ÷ 10 kg = 23 mg/kg.
Frequently asked questions
How much chocolate is toxic to a dog?
Mild signs may occur at 20 mg/kg of methylxanthines, cardiotoxic effects at 40–50 mg/kg and seizures at ≥ 60 mg/kg [1].
Which chocolate is most dangerous?
Cocoa powder contains 28.5 mg/g, unsweetened baking chocolate 15.5 mg/g, semisweet and sweet dark 5.3–5.6 mg/g, milk chocolate 2.3 mg/g and white chocolate 0.04 mg/g [1].
More toxicology calculators
References
For veterinary professionals. Information supports — never replaces — clinical judgement; always check the current product label and local regulations.