Grace, I'm so sorry to hear this. My Storm had to have the PU surgery because he became blocked 2 times and diet alone wasn't enough. He was on Royal Canin Urinary S/O in both canned and dry and he seemed to like it much betterthan the Hills brand. It's also supposed to help both calcium oxalate crystals and struvite crystals. I actually had all of my cats on this diet for a while until Starr become very sick.

Now with the approval of both my regular vet and my holistic vet, Storm is now eating a grain free diet and is on Innova Evo dry and the canned food which is called 95% Chicken & Turkey. I also add some water to his canned food so that he gets even more moisture. He loves it so much that he's been trying to wake me up in the morning because he wants his breakfast asap. He hasn't done this in years.

All of my cats are on a grain free diet and my holistic vet said that the grains can cause crystals in cats so having them on a grain free diet is best. It's also more like the raw diet without really being raw. I know it costs a bit more but my cats don't need to eat as much of it because the canned food is very rich and the dry food has a lot of calories. I hope that you'll be able to find something that all of your cats will like. I also mix the canned and dry food together for some of my pickier cats. Good luck.