Ultra Chewys Naturals Beef Femurs come from free-range, grass fed cattle, and are high in protein and low in fat. Ultra Chewys Naturals proudly offers the healthiest, most natural pet treats available on the market. These are GREAT for large heavy-chewing dogs, and are sure to keep them busy chewing for hours if not days each time. All Ultra Chewys Naturals Beef Femurs come from cattle that are free of growth hormones, steroids, and antibiotics. They are slow roasted in our own ovens for a distinct flavor free of any unsafe additives or preservatives.