Indoor Cats Cats that live indoors tend to lack exercise. As a result, they not only tend to gain weight, but also their intestinal activity slows down, causing food to stay in the intestines longer, which can lead to stronger-smelling feces or soft stools. In addition, indoor cats spend a lot of time grooming themselves, so they are prone to hairballs. Feline Health Nutrition Indoor contains over 90% highly digestible protein to maintain healthy digestion. By appropriately adjusting the calorie content and adding dietary fiber, it helps to control hairball formation. Available in lines for adult cats, long-haired adult cats, and mature adult cats.