We all know chocolate is toxic for canines, but did you know that caffeine is also one of the most dangerous foods for dogs? Coffee, coffee grounds, tea, sodas, energy drinks, weightlifter supplements, OTC pills, and diet pills all contain caffeine.

Coffee contains a stimulant called methylxanthines.

Methylxanthines stimulate the nervous system in dogs, causing restlessness, vomiting, diarrhea, excessive thirst, heart palpitations, seizures and even death.