bakers chocolate is the WORST for dogs. but the chocolate drops for dogs---its made out of carob chocolate. so when you go to a dog store--all those chocolate flavored stuff is made out of carob.
i'm thinking that theoretically you could go to the diet section of the supermarket and give your dog some of that---but dont do it unless you talk to your vet! lol.
My parents dog is part black lab (not as tall as a black lab though) and has should probably be dead if you go by the amount of chocolate she has eaten. In the past 13 years she has gotten into 2 full bags of Hershey kisses and about 10 chocolate Santas. It has never hurt her. Half the time we have no idea how she manages to get the stuff. Most of the time it is in the middle of the dinning room table. <_<