Tasman's Natural Pet Co is proud to offer a unique line of all-natural Bison collagen-based chews. Don't mistake these as typical rawhides - they are far from it! These collagen-based bones are made from US Bison which means no hormones or antibiotics are passed along to your pet. Tasman's Natural Pet Co. doesn't use any harmful chemicals in the manufacturing process either - another plus for your pet's digestive system! These knotted bones are great for dogs with allergies or for owners who want to provide their pet with an all-natural diet, even when it comes to treats! Be sure to check out all of Tasman Natural Pet Company's products as their natural chews also come in a Wild Boar k variety and both lines have a variety of shapes and sizes including chips, bones, rolls, twisters and rings.