When I adopted my dog the vet recommended several brands that made 'single protein' foods, based on the idea that white haired dogs and bully breeds (he's both) are prone to developing skin allergies because of food, and using a single protein food would make it easier to figure out what any allergies were to, and to pick a different food from the same maker with a different protein. She gave me a list of brands she liked which included zignature, taste of the wild, etc. I switched to diamond naturals 'skin and coat' version a while back (which I think is salmon based) because it was equally well liked by vets, and is cheaper than zignature, etc (and my energetic bozo goes through a 30lb bag in a month)