BarknBig Bison 6" Marrow. We call them marrow bones for a reason. The access to the marrow is easy. The size of the bone is spot on for mid size dogs 30-80#. You will notice slight chipping on the edges of the bone as your pooch gets deeper into the marrow. That is normal for these bones. If you have a super aggressive chewer, and see large pieces an inch in size missing, take the bone away. Your dog has graduated to an aggressive chewer and should be presented a shin bone in it's place. If your dog does well with the bone and does not take massive chunks off, you have a life long friend. Bone marrow has many health benefits like healthy fats for skin and coat, vitamins and minerals from the red blood cells that used the marrow as a conduit in the body. The edges give means to a good teeth cleaning and an overall happy dog.