Special Features: - All natural, FDA approved knuckle bones that're sourced from grass-fed, free-range, Brazilian cattle. - High in calcium, iron and zinc which helps your dog's body fight off infection, maintain a healthy immune system, and provide energy to help support brain functions. - Baked to rid the product of any possible bacteria and locking in natural flavor for an irresistible flavor with tendons still attached to give your dog an extra dental workout. - Barkworthies are preservative-free, hormone-free, and antibiotic-free. Contains no grains or gluten. - Long lasting for medium to large breeds and provides a durable chew for aggressive chewers. - Chewing also supports dental health by cleaning teeth of plaque and tartar. Ingredients: Beef knuckle bone Guaranteed Analysis: Crude Protein: 28.0% min Crude Fat: 15.0% min Crude Fiber: 0.4% max Moisture: 6.0% max Caloric Content: 973 kcal/treat