This thing is a God send! Luna is a 10 month old Jack Russell at a whopping 13 lbs, she is one spunky, tough chewing little thing. After we bought this toy, we put a bully stick in it and she chewed on it for over an hour, she eventually was so mentally exhausted that she took a nice long nap! Our Luna gets bored very easily with most toys, but this one has kept her engaged for hours! She doesn’t put it down, she carries it with her everywhere she goes. It’s a must have for tough chewers!