I have aLilac Point Siamese cat named Fidget that will turn 7 on June 11 this year. A year ago he developed a urinary track problem and the vet prescribed a very expensive dry food that he kep throwing up. In my frustration, I researched other less expensive however as healthful brands and found Purina One. I first tried the indoor formula and since have even tried the Sensitive formula. I also have a 3 year old black cat named Sassy and she loves both formulas and it keeps Fidget from not being able to keep his down. I really am sold on  Purina and feel that any formula will not only give cats and dogs the best in nutrition but helps keep them happier. Before I switched Fidget acted like an old cat and would not play just laid around and slept alot. Now  both of my cats coats are shiny and their eyes are bright and Fidget has found the "kitten" in him and gives Sassy the run for her money....literally they chase each other around my home.