Sam and Rusty, 9 months old, are our two rescue cats. When they first came to us, we started them on Purina Kitten Chow, which they liked. Then I noticed Purina One in the grocery store and liked the fact it had more protein then the chow. Since they were pretty thin when we got them, we decided to give it a try. The results are amazing! They are now at their proper weight, very active and energetic, with super-shiny coats. Our vet said he was glad we switched, as it has a higher grade of protein. In a few months, we will transition to the indoor formula. Great product!