They are cute and maybe last about 15 minutes and my dog is not an agressive chewer and she is a medium size. Good for dogs with no teeth I think, but if you dog chews at all, this tough material doesn't hold up.
Our dogs don't seem to like the taste of these, and weren't very interested in them anyway. They're made of cheap vinyl, and the balls don't bounce at all. Some of the paint on the spines of the hedgehog came off as well - Yuck! Spend a little more money and get something that will last. We love the Ruffian toys here.