http://healthydogsguide.blogspot.com/2015/03/foods-your-dog-should-never-eat.html
Coffee, Tea, and Other Caffeine
Caffeine in large enough
quantities can be fatal for a dog. And, there is no antidote. Symptoms
of caffeine poisoning include restlessness, rapid breathing, heart
palpitations, muscle tremors, fits, and bleeding. In addition to tea and
coffee - including beans and grounds -- caffeine can be found in cocoa,
chocolate, colas, and stimulant drinks such as Red Bull. It's also in
some cold medicines and pain killers.