Canadian Brand. Rollover Small Porkhide Knotted Bones are 100% digestible porkhide, made from the inner layer of pork skin. No chemicals are used in the processing of these chews and porkhide is a much healthier alternative to traditional beef rawhides. These all-natural, low fat, high protein chews are a great way to help clean the teeth and gums and since porkhide softens when chewed, are an excellent option for all small sized dogs from puppies to seniors. Each Small Porkhide Knotted Bone is approximately 4-5" in length.