My 10LBS yorkie chews though everything which is surprising for a little dog.. but toys are his favorite and his mission in life is to destroy them all. HOWEVER he can not seems to get though this one. It is amazing!!! I was sold on the "money back guarantee" but it looks like we wont be needing that. my dog chews on his hurley non stop all day ever day and there is not one dent, chuck missing, nothing. I wish they made more toys like these considering we already own all of them!! I heard it works in water too, but i have yet to test that because i don't want to lose it!!!