My cats all eat the Hills CD formula. Only Pete needs it, but my vet said it was safe for all of them. They all seem to like it too. Pete gets the canned version too. The rest of them get different kinds of canned food.

Don't beat yourself up about letting him eat a bit of other kibble. From the sounds of it Pouncer has idopathic FLUTD--that's what Pete has. Just means they don't actually have a clue what causes it! Diet is just a best guess.

Getting more liquid into him is very important. Does he like canned food? Pete was on a canned food only diet, much to his delight, at one point when he was having constant flare-ups. I also sprinkle a bit of parmasen(sp??) cheese on his food occasionally. He loves it and it's makes him thirsty! Chicken broth, drippings from a roast, are good for baiting water too.

How old is Pouncer? My vet told me that when a cat develops FLUTD young, they sometimes outgrow it as they age. That seems to be happening for Pete. He did need a PU surgery, but that doesn't cure the cause, only the life-threatening symptoms. Pete still had difficulties after the surgery, but they have diminished as he's aged. He was two when he got sick. He's 6 now. It's been well over a year since he had a flare-up!

Good luck! It's a frustrating disease to deal with.