I'm not sure about that!My small dog T-Bone eats Eukanuba, and let me tell you, he is healthy and strong. 5 years old and feistier than ever. My uncle is a Vet and he recommends this Eukanuba dog food to many of his clients including my dog. Mind you, he has been practicing for about 30 years now, so I can assure you that he knows his stuff. My dog likes the taste also!