I have been told milk chocolate is the least most toxic to dogs and bittersweet is the most dangerous, lethal and deadly to dogs. I am not sure if that is true but I do trust the source it came from. There's a higher concentration of the deadly "stuff" in the bittersweet then there is in the milk.

I took Graham to the salon with me to get my haircut last week (they love him to pieces there) and I was letting him visit with a little boy in the salon and the boy (without my noticing) gave him a few licks of the hot cocoa he had in a cup. He got my attention by saying, "hey, Graham likes hot cocoa" I think that was Graham's first taste of chocolate and I was glad he did not get very much before I came running over telling him to NEVER give any dog chocolate and that it's very bad for them. I told that little kid that it's bad to give a dog unhealthy food on a regular basis, but told him how much worse chocolate is then anything. Thankfully Graham did not get sick, but I think he only got a few licks of it.

Since I worked at a vet for so long I did see alot of dogs poisoned. I remember this poor golden ret. pup that nearly killed itself by eating chocolate, it was in the vet on IV fluids for several days because it's kidneys were just shot. Then it finally went home, much thinner and still weak, but ALIVE...a week later the poor pup with eating problems, ate it's flea collar and, again, nearly killed itself. The pup was only about 12 weeks old. I bet those poor owners have their work cut out for them with that lil pup!