Hi Julia-
Your GSD is a large breed and you need to be extremely careful about how much calcium he is getting in his diet. Too much and he is at high risk for developmental orthopedic disorders. Not to mention if he is an AKC GSD I would be even more careful since they are now being bred to have a sloped roach back.
Raw diets are very difficult to balance without the help of a board certified veterinary nutritionist. I would highly recommend seeking out the help of one before continueing this diet.
