I love Solid Gold Wolf King. My big dog did fairly well on that. I used it until I got the tiny dogs. Solid Gold was formulated for Great Danes, and I am thinking that Yorkies do fit into that group. Merick makes a human grade food also, and I was happy with that for quite awhile. I try to avoid...
Purina doesn't make anything without corn in it. The better the food the less you have to feed, and the smaller the poops. Diamond may make a single grain food which should be a lot better than multi grain foods. Unfortunately as the dog food gets better the cost goes up. I do know some have...
Taste of the Wild My pups only get the Buffalo and Venison variety. The best is a raw diet. I loved Nature's Variety. It was just to expensive for the number of dog I have. I might go back to it after the big dog passes.