Every dog is different, but I would never give mine chocolate. Ever. My daughter left a dark chocolate candy bar on her dresser once and my dog got it. I was lucky to find her right away after she got it and called the vet. She was starting to have effects so I had to give her peroxide and then took her into the vet where they flushed her stomach with charcoal. She's an active 25lb whippet, all muscle no fat so once she ate the chocolate it started hitting her system fast. The vet said the purer the chocolate the more dangerous it is, but to me ALL chocolate is dangerous when it comes to any dog.