I was able to get the butcher's at Publix to cut me a VERY SMALL marrow bone for Jack. I just don't know how long I need to boil the bone for? Also, whenever I have bought the marrow bones from Chris's they are always "cleaned out" in the middle and very smooth. Do I need to do the same? Or is it okay for Jack to get the stuff in the middle. Will be ordering antlers, but wanted to try doing my own marrow bones. Thanks guys!