My dogs are OBSESSED with these. It takes them a while to go through one, but I end up buying one every few months or so so that they can have a fresh one. Actually I have to buy 2 because otherwise my boys will fight over them! They are serious chewers, about 40 lbs each, and it will take them at least 3 months to chew through one of these. Only knock is they always send the brontosaurus (which wasn't a real dinosaur anyway); I'd love to see one of the other dinos!