BarknBig Beef Tendon Fillets. We call them the 'filet mignon' of Tendons because it is a choice cut. We literally have to fillet the fat from around this hyaluronic acid filled chew. Hyaluronic acid is used in the body to manufacture its own glucosamine for hip and joint health. They range from 4-6" in length and are perfect for small dogs. They still get plenty of the good stuff and you will notice the tendon get stringy when they chew it. This is unique to tendons as it is what we refer to as nature's floss.