Large or small, Iams Multi-Cat nourishes all your adult cats. Formulated specifically for mutli-cat households, Iams Multi-Cat Formula helps all your adult cats maintain proper body condition, without compromising on meeting their individual nutritional needs. For larger cats that tend to gain weight, L-Carnitine is a proven fat burner, while the addition of Vitamin A can help lower the risk of gaining extra weight in the first place. We've also included high levels of protein to help both heavy and trim cats maintain leanmuscle mass and a healthy body condition. Plus, our patent-pending fiber system helps reduce the likelihood of hairball formation for smooth digestive function, and optimal colon health, and helps reduce litter-box odors.