Chocolate is toxic
Most dogs love chocolate, and some cats too, but can be dangerous in some cases. It often happens at parties, where chocolate is consumed mainly in cold climate countries where we take hot chocolate cup.
Some dogs and cats tolerate chocolate more than others, although the toxic dose varies with each animal, chocolate has a substance called theobromine which is a aminoxantina (which is also the protein-tea-and caffeine-coffee) are analogous of adrenaline are therefore as sympathomimetic, or an increased dose will be similar to an increased dose of caffeine and a greatly increased dose (overdose) is like an overdose of caffeine, a substance that in high doses can be dangerous for animal health and seriously compromise its vital functions. The chocolate cup that has 10 times more substance than chocolate milk.

The theobromine acts on the animal's body as follows:

It increases heart contractility
It acts as a powerful diuretic, causing dehydration
It affects the gastrointestinal system, causing vomiting and diarrhea and can cause ulcers in the gastric mucosa ..
It affects the nervous system, causing convulsions and sometimes death.
If it is suspected that the animal ate or drank a liberal serving of chocolate, turn immediately to the Veterinary Clinic for his checkup and observation.