Re: he's not old yeller or bambi ...
Bones and antlers I know are very popular with wild rodents and are quickly gnawed to nothing in the wild. The only thing I would want to be careful of is that he isn't getting too much calcium because unlike his wild cousins, his diet is already fortified. Excess calcium can cause all sorts of problems but I'm sure as an occasional treat in his playpen that he wouldn't get enough in him to cause trouble. They are expensive though so if that's an issue then I would stick with wood.
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