Since both Storm and Cirrus had to have P.U. surgeries, I now have to feed all 4 of my boys Royal Canin S/O formula. I buy both the dry and wet and Storm and Sunny have become hooked on the wet stuff which I also mix with dry. Cirrus will only eat dry and Sky will eat his dry and Storm's and Sunny's leftovers. Storm may have to be switched to Hills Prescription S/D for a while but it all depends on his next urinalysis results.