These American bison rawhide products are 100% natural-no hormones, no antibiotics, and no harmful chemicals. Tasman's have found that dogs who suffer from food allergies have not had problems with these bison rawhides. Now your dog may be able to once again enjoy the teeth cleaning, shoe-saving pleasure and benefits of a natural rawhide chew treat! Plus, your dog will love the rich taste. Available in a number of shapes and sizes for all sizes of dogs.