I have a very large black Labrador , he is not so much a dog as a 4 leg food disposal system.
I know chocolate is bad for dogs but if you read the actual amounts necessary to cause a possibility of a bad effect it is HUGE . My Labrador weighs nearly 30 Kgs , he would need to eat at least 2 Kg of solid chocolate in less than hour for there even to be a small possibility of a bad effect. He eats chicken carcasses whole and never a hint of a problem. He has managed to eat the large bone from a cows hind leg in its entirety inside a week , the bone was nearly as big as him when he first got it. Normal dog chews are dispatched within a few minutes . He can totally destroy a full size leather football in less than 1/2 an hour. Tennis balls take around 30 seconds he can eat them and sh!t them out the next day no problem.