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I think the deer antlers are pretty tough to be honest. Have you watched those guys during mating season smashing their antlers together?? My SIL has some for his dogs and they don't seem to splinter at all. I need to get one from him next time I'm over there. They're not cheap, but you could get one and then watch your pup when he's chewing for the first while to make sure he's not breaking it up. I know Halo is a very hard chewer and and actually cracked up a Bison knuckle I had bought her a few years ago. I had been assured it was great for heavy chewers.
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