"I bought this for my energetic 6 mo. old kitten. She was interested immediately, but seemed to only want to watch me spin the mouse on the track, with the occasional bat from her. For the next couple days she still seemed only moderately interested, but then all the sudden she decided it is a great toy! Now she'll spend all evening pouncing on the mouse and spinning it around (it spins very easily). She has even tried putting other toys on the track. The toy is rather light, so occasionally it moves across the carpet as she plays. It's not a problem to play with the mouse, but it does make the scratching pad rather impractical. "