Melissa and Franklin started a discussion on safety months ago after Franklin broke a tooth.  I commented then that I have had bones that were mostly cartilage and seemed safer to me.  I take the bones away from the dogs when they have finished the joint part and throw away the actual bone part as that is what I think causes breaks.  I am including pictures of 3 old bones in various states of destruction and a picture of 2 brand new ones so that you can see what they look like.  I believe that these are safe.  As amazing as it may sound even when Randy was a baby he was able to make little tooth marks on them because they are not too hard.  Of course, Randy always picked the biggest things he could find to go after (alpha male).