It's not a bone, but my dogs favorite treat/chewy is the everlasting treat ball he is an amazing chewer and there's not one hole in the ball and the treat is hard, so takes awhile to get it out, put it in upside down for more of a challenge.
R.I.P- Smokey my GSD/Husky. You are my hero, my heart, my soul and you will forever remain in my heart. You were a true companion. I love You and miss You so much. Run like the wind!!