Thank you for everyone's replies. Sorry for the delay - moving has been quite the ordeal. Espeon has handled it like nothing has changed; Voltron, on the other hand, will only come out at night and if something makes a noise he's off to hide again. Maybe a cat tree won't be in their immediate future... I'd hate to scare him with yet another new item (since a new house is still overwhelming to him) but its good to know for the future