Barkworthies Femur Bones are as natural as they come. Femur Bones are center cut from the femur and full of nutritious marrow, providing your dog with a highly digestible source of calcium. Calcium intake is crucial for your dog’s body to maintain strong bones and teeth. This bone is also high in Iron and Zinc which helps your dog's body fight off infection, maintain a healthy immune system, provides energy to help support brain functions and gives them a zest for life! Barkworthies Femur Bone is a hearty, durable dog chew that will give your pet hours of chew time as well as cleaner teeth!