Barkworthies Smoky Shin Bones are baked with pieces of meat and tendon still attached, so they're naturally packed with appetite appeal! Shin Bones are full of nutritious marrow, providing your dog with a good source of calcium. Calcium intake is crucial for your dog's body to maintain strong bones and teeth. Barkworthies Smoky Shin Bones are also high in iron and zinc which helps your dog's body fight off infection, maintain a healthy immune system, provides energy for mental agility, and gives them a zest for life! These extra-long lasting chews are great for medium to large breeds and a durable option for aggressive chewers. Barkworthies Smoky Shin Bones will give your pet hours of chew time as well as cleaner teeth! These bones are USDA & FDA inspected & approved.