We use Flint River Ranch and our dogs love it. They started out on the regular formula, but we've since switched to the lamb and rice formula (no wheat, minimal grain). We've tried some other foods (Nurto Ultra, Innova, Newman's) but our dogs chose Flint River everytime -- and they seem to do much better on it.
If you're interested we get ours from a great website that has some kind of discount going on now - A+ Flint River Ranch at
Flint River Ranch Dog Food - The Best Natural Dog Food