My dog LOVES this toy. The problem is, it doesn't last for mjore than a couple days. I thought it was the battery, or a defective toy, but I bought a couple others over the last couple years and the same thing always happens. I have a yorkie and when he grabs it and plays with it, it must break apart inside and interfer with the bouncing mechanism. And the knobs break off way too easy. Too bad. Wish they would make a better one.