Love these things! They are just as much fun for the humans as they are for the pups. We have been using ours with the rubber glow ball that Chuck It makes and its lots of fun in the dark winter evenings, and help the pups get their exercise when we don't go on walks. Dont buy a Chuck It at a pet store, buy it here, its so much less expensive. The 26M was a perfect size for our Pittie Mix, and another Pittie that lives in our building.