Thanks for your responses! My cat has been in for his regular checkup this summer and is a healthy boy! I just recently decided to change his food to something that was better for him and have been trying several brands. Either he won't eat them or they make him sick (he threw up every day when I gave him Royal Canin.) He's got a very sensitive tummy and digestive track, so maybe I'll will go talk to the vet. So far I have gone on the recommendations of local high end pet stores and that hasn't been successful.

Thanks!