Hmmmm well I have read on here that royal canine isn't all that great even though vets swear by it like here they say Science Diet is the best and its not really Sheldon did TERRIBLE on it. Have you tried Nutro? I have heard its a great food also. Merrick Whole Earth Farms is also a really good one. Sheldon did pretty good on it problem is the only place I can get it is on the internet so I might be going to Amazon to put him back on it. @cowsmom and @desertskybulldogs can you guys shed some light?