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In page Theobromine:

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Theobromine is the reason chocolate is poisonous to dogs. Dogs and other animals that metabolize theobromine (found in chocolate) more slowly[1] can succumb to theobromine poisoning from as little as 50 g (1.8 oz) of milk chocolate for a smaller dog and 400 g (14 oz), or around nine 44-gram (1.55 oz) small milk chocolate bars, for an average-sized dog. The concentration of theobromine in dark chocolates (about 10 g/kg (0.16 oz/lb)) is up to 10 times that of milk chocolate (1 to 5 g/kg (0.016 to 0.080 oz/lb)), meaning dark chocolate is far more toxic to dogs per unit weight or volume than milk chocolate.[citation needed]