The industrial feeds have tremendous nutritional differencies. These differencies can be seen in any dogs health. In growing puppies these differencies can culminate into serious growth deformations and illnesses. If the diet does not contain all nutritional rawmaterials, the puppy cannot develope in best possible form. The puppy's developement is directly linked to its diet.
Many breeders flatly blaim the genes when faced with hip dysplasia.
We must be able to look at this problem from actual facts. The effects of given diet is paramount. The speed of growth it astonishing and this speed sets the demands for the quality of nutrition. When the puppy grows, these demands change. The problem with large breeds is too fast growth.