
It depends what you feed. The 'old-fashioned' method, using a protein source and plain biscuit, allowed for variety in the protein - beef, lamb, tripe, chicken, fish. Pups of most breeds were given three-quarters of an ounce of food (equal volume protein and biscuit) per pound of bodyweight, split into several meals. This involves regular weighing of your puppy!
You could replace one or two of these meals with an equivalent portion of a good quality modern complete, to be sure the pup was getting a good variety and the right vitamins and minerals.