Big and medium size dogs will enjoy gnawing away at the thick and long lasting split antler. Barkworthies USA Elk Antlers are naturally shed and sourced from the Rocky Mountains. They are cleaned, cut and packaged to be ready for chewing sessions. These odor-free chews contain soft marrow and are a source of zinc, calcium, manganese and iron. Providing natural chews is good for dental health. Chewing antlers can help remove plaque and tarter from the teeth.