Which dogs can not have chocolate?

Answer 1

All of them. The problem with chocolate is that it contains a substance known as theobromine, and this substance is toxic to dogs but not to humans.

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Answer 2

Some dogs *do* like chocolate, and that can be a health problem. Some of the chemical components in cocoa and chocolate can be extremely toxic (poisonous) to dogs, because their bodies do not metabolize it as human bodies do.