Have you consulted a canine nutritionist or gotten a recipe from your vet that was prepared by a canine nutritionist?
Homecooking is great, but if not done correctly can harm your dog. Many vets and nutritionists recommend waiting until a puppy is a year old before starting him on homecooked as a nutritional deficiency in a developing puppy could cause permanent damage. The calcium to phosphorus ratio especially has to be correct or it can cause cardiac, skeletal or neurological problems.
Have you seen this? It is pinned in the Library:
http://www.yorkietalk.com/forums/yor...itionists.html