Posting it here since I think it may get more traffic in this forum. My cat has always been a bit of a.... vomitter? He's 10 years old, had been on Iams most of his life because none of us knew any better. Back then, he would vomit probably once a day. It was just his norm. About 4ish years ago I switched him to California Natural and his vomiting became less frequent, but still happened too often (maybe once a week or so). July 2010 he had a urethral obstruction so he has been on Hills C/D ever since. And the vomiting is bad again and probably worse than it was when he was on Iams. It kind of comes and goes in waves--for example, at the moment he has puked like a bazillion times in the past week. But before this bout started, it had been a few weeks since he'd puked. The past few days though it seems like every time I turn around, there's cat vomit! There's nothing in it btw.... sometimes there'll be food in it but most of the time it's just bile splattered across the floor (good description I know). In the back of my mind I feel like I KNOW this is a food issue but we don't want to risk taking him off the prescription diet. The vomiting is the only issue, he's otherwise a normal healthy cat - he eats, he drinks, he plays, everything in the litterbox is good and normal. He hasn't had bloodwork since his obstruction but since the vomiting isn't anything new.... I'm not so inclined to think there's going to be any changes there.... Thoughts? Suggestions? Do you think canned vs dry could make any difference? (Currently he's on dry). My mom was open to mixing the C/D with another food, but I told her that if it is a problem with the food, then it's not going to help unless it's eliminated from his diet completely. She doesn't want to risk that. Stuck between a rock and a hard place!