My Shih Tzu Shadow who is 7 recently had surgery for bladder stones and the vet recomended putting him on a U/D dog food diet. I need to find a dog food that will be good for him as well as his brothers who are also Shih Tzus their ages are 2,3 and 5. My dogs pick at their food all day long and it would be almost impossible to feed them each a different diet, because they would be eating each others food. Does anyone have any suggestions?