Before we try Hills z/d, I want to try a pea-free quality food. Can anyone recommend a good quality dry food that may be low-allergy? We've tried Blue Buffalo Wilderness and EVO but one of our cats seems to have some sort of allergy to it. Previously we were feeding Purina indoor which she did ok on, but she went down hill when we switched to the others. Also, any wet food that is good quality? Our cats will NOT eat anything with fish. Thanks!!