The Country Butcher Beef Center Bone Dog Chew Treats are beef center bones. Most of these bones will have succulent marrow in the middle of the bone along with tasty meaty pieces left on the bone. Each of our center marrow bones is dipped in liquid smoke and then slowly roasted. These USA natural beef femur and tibia bones have no artificial ingredients and are best suited for small size dogs. The Country Butcher marrow bones dog chews are 100% grown and made in the USA.