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 highly digestible source of calcium. Calcium intake is crucial for your dog's body to maintain strong bones and teeth. Our 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. These bones are USDA & FDA inspected & approved. Most Barkworthies' all-natural dog treats and chews are completely preservative-free and additive-free. Please note that this product is not for human consumption. Please supervise your pet while giving a treat or chew and dispose of properly if it becomes a choking hazard or develops sharp edges.