so far I have only used the first boney as puppy only 4mnths old, she enjoys it greatly and chews for ages on it. now she has lost a few teeth she still uses it just the same. i used it when she was biting at my hand a lot, just gave her that instead to get her to think mmm this is better to chew at. I throw it for her and she runs off to get it and has another long chew on it. Little bits do come off it as it wears down, easy to see and pick up so not swallowed. Very happy with the product and it has just now got one end bit chewed away after a month of daily chewing. recommend this product definately.