A coulpe of years ago my cat had a bladder stone and had to have surgery because her urine looked like red Kool-Aid. They said it was from her food, and that I had to switch her food so that she would not get it again. She is on a special food for cats prone to urinary tract infections and bladder stones. It is the Royal Canin SO. She has gained a lot of weight since then, and I don't know if it is from the surgery or the food. She weighs about 16 or 17 pounds and will be 4 years old in September. She loves the food though, and is very demanding about asking for it. I have tried to put her on a wet/dry food diet, but she will have absolutely nothing to do with the wet food, she won't touch it, and in fact looks at me like I am crazy. I guess my question is what can I do about her weight? And are there foods out there that would be better for her and not give her another bladder stone? Thank you so much for your help.