My dogs go bonkers for these things. We order a pack of them every Christmas and they usually last the dogs all year long. They go through one every two or three months. They destroy the actual bone-shaped Nylabones in a couple of weeks, so we shifted to these dinosaurs a couple of years ago. The nubs on the dinosaurs help keep junk off their teeth, and it keeps them from chewing on other things, like shoes and underwear.