The Greenies Feline Greenies SMARTBITES Hairball Control, Chicken Flavor is a high-quality, all-natural cat treat that is perfect for supporting a healthy digestive system. Made with a fiber blend that helps promote healthy digestion, this cat treat features a unique flavor that your cat will absolutely love. The Greenies Feline Greenies SMARTBITES Hairball Control, Chicken Flavor is also low in calories, making it a perfect choice for maintaining a healthy weight.