Barkworthies, 6" Dog Collagen Beef. Made up of 95% collagen, making them good for your dog, inside and out. These long-lasting chews are wrapped in delicious beef for a tasty treat. Collagen supports your puppy pal's healthy skin and coat, promotes mobility and flexibility, and can help ease joint pain and stiffness. Made with all natural ingredients. High-protein, low-fat bones. Helps keep your pup occupied for a long time. Naturally high in collagen. Easily digestible.