I've been feeding him Purina One puppy food for large breed dogs. He loves it. The primary ingredient is Chicken (Well, probably chicken byproducts but that's beside the point- no dog food contains white meat only)

When the bag I bought runs out I'll try the little 5lb sample of Science Diet and see how he responds. I'm not all that interested in getting into an arms race on dog food- otherwise I'd be cooking food for him every night. His vets said in their opinion it was preferable to feed a meat-as primary-ingredient food- even as they handed me the grain-first Science Diet. BTW- rice as an additive does not aggravate a gluten intolerant dog. Rice is gluten free as gluten comes from wheat, barley, oats and rye.

He was weaned on Purina Pro Plan food and came to me with a beautiful coat. He is now 10 days on Purina One and still beautiful. If He can maintain weight and growth and coat I'll leave him on the cheaper Purina One. As he matures and has to work harder I'll think about upgrading.