My breeder's husband hunts and her dogs LOVE the antlers and hooves they get during deer season--straight off the carcass.
When my dogs were teething, I would soak in dilute chicken broth and then freeze those big knotted rope toys. Neither one would chew on them plain, but once they're infused with a little eau de chicken, they go to town. And the freezing seems to make them a little more satisfying to teething puppies. I don't know if your adult would give a squat about whether or not they were frozen, but it might be a nice treat when it's hot out.
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