Although I feed my baby a more expensive food that is not found in grocery stores, I heard the same thing several years ago on 20/20 I believe. They interviewed vets and talked about how most brand name dog foods were good. I guess I would believe it, and if I had a bigger dog I would probably use Purina. However, our baby has had health issues and a sensitive stomach since we got her, and now I treat her differently than I have any other pet I have ever had.
I guess I spoil her now.