My personal opinion is: Don;t feed them any sort of bones or any rawride. I just had a bad experience with Mojo. My aunt have him a little rawride bone, a tiny one, he only ate half. Few days later he stoped eating, was throwing up daily and had diarreah (even pooped blood). He had some sort of reaction (acute gastrites??)
It broke my heart to see my little boy like this....it costed me a few hundred dollars to treat him but the worse part was seeing him like that.
Not that this will happen to all dogs, but i personally think is an unecessary risk!