From the moment we opened the box Nel was going crazy. She rubbed and played with each piece as we assembled it. The first thing she did after we set it up was to get in the little cave at the bottom. Once she sniffed and rubbed each part of that she climbed to the top. There she discovered that swinging ball and went completely nuts. The only setback was during the night, yes she batted that ball all night, the ball came off. We reattached it and it continues to be her favorite place in the house.