Purina puppy isn't a high quality food bur if you switch at such a youg age please do so very gradually over a few days. Nutrical is touted as being reall great on here and when you have such a youg dog you do need to watch out for low blood sugar. I brd yorkies for over 20 years and never used any nutrical. If you do use it give sparingly as it can cause diahrrea if too much is given. Your puppy is very youg to leave it's mother. Most breeders keep them til 12 weeks |