Are you coming to B3 this month? I can bring you a sample of what ours are eating—Royal Canin SO Moderate Calorie Urinary Tract Formula. It needs a prescription, and it's pricey, but it contains no artificial preservatives. There's a canned version, too, but only two of mine would eat that, so for canned they get Fancy Feast Liver & Chicken with a teaspoon of pumpkin and four digestive formula Greenies.