Greenies SmartBites Healthy Indoor Tuna Flavor Cat Treats are rich in fiber, richer in taste, and low in calories, making a healthy, delectable reward with numerous benefits for your cat's health including hairball prevention and healthier digestion. Delicious, all-natural, low-calorie cat treats Rich in fibers to enhance digestion and prevent hairballs Excellent source of real proteins for healthy metabolism SmartBites veterinarian-approved cat treats feature Greenies' unique Fiberblend formula, a special blend of plant-based fibers to promote healthy digestion and minimize hairball formation.