Maybe this IS an issue with rescues. My Bela (puppy mill mama) will go into any small space she can find. Especially under the bed or under/behind the low-hanging clothes in my closet. And behind the chair in the bedroom. She just likes small spaces. We've almost cured her of the under-the-bed thing. But she still prefers smaller spaces. In fact, the family room (with a tall vaulted ceiling) kind of freaks her out.