Chocolate contains a substance called theobromine that neither dogs or cats can metabolise.
This toxic component accumulates in the blood causing serious systemic effects. The symptoms of intoxication occur rapidly, in a few hours, and include vomiting, diarrhoea, hyperactivity, tachycardia, tremors, seizures, loss of consciousness, coma and death in severe cases.
So, no exception! No chocolate or any cocoa based product for our pets! We have to resist to their eyes, they do not know that it is toxic and we have a duty to protect them.
Actually, for us it is great news, so that we can keep all the chocolate for ourselves! But we tend to eat it hidden from them to avoid their begging eyes!