Barkworthies Smokey Shin Bone dog treat is an all natural, FDA approved, beef shin bones sourced from Brazil. Cut from the center of the shin and full of nutritious marrow, these bones provide your dog with a highly digestible source of calcium. These bones are also high in 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. Extra-long lasting bone 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.