I wouldn't let him chew on one. I have a lab/border collie cross that loves to hunt horns. I always make it very special when she brings one in, the horn needs to be what brings the rewards,. Another thing, when you hide one at home make sure the dog can't see it easily. Made that mistake and she wanted to find it by sight and not trust her nose. Was hard to get her over that. I've heard that you should not handle the training horn (use latex gloves) because they learn to go to your scent and not that of the horn. Can't say that that made much of a difference for my dog, but possibly something to consider. I always have her bring me the horn and put it away once she delivers it, then the reward. I don't use treats, mainly praise and sometimes a tennis ball. She will do almost anything for that dang ball......