What are the cats doing? Buffy and Willow are doing this:
It was always difficult to get Wacka & Bullwinkle into the cat carrier... had to back them into it and then stuff in the paws while trying to get the door shut. But Buffy and Willow love their "cat condo".
In fact, if you move the cat carrier to get something out of the locker underneath, Willow gets worried and jumps into it. She also doesn't like it if the door is closed which is why the baseball hat is wedging it open.