Our Natural Filled Bones are made from thick, durable, and smooth beef femur bones, naturally cleaned without the use of bleach or other harsh chemicals. Then, through a proprietary process, our cooks hand-fill the bones with one of three wholesome, dog-approved fillings. These bones offer a healthy and irresistibly tasty long-lasting chew for the familys moderate and power chewers. And like all Redbarn bones, Natural Filled Bones help support your dogs mental and dental healthy by acting as natural boredom-busters, stress-relievers, and plaque removers.