Well I have 3 cats, all indoor only. Ages are 1 year 9 months, 9 months and 3.5 months. I've tried a LOT of different cat food and been displeased with it all. Right now they're on Purina's Indoor Formula. Not happy with it but they have to eat something while I figure things out. I would prefer a Urinary Tract Formula but it's not a necessity. Please give me some input and ideas.