I would imagine Isabella does too. For several months before we took it down, we left the door open. She could be trusted in the house but returned to her expen on her own while we were away. When she began preferring her soft crate to sleep in, she uses that now and we removed the pen for a couple of months before getting Raider so it would have time to "reset" for the new puppy.
I left for the grocery store this evening and placed Raider in the expen before leaving. When I returned home, I peaked through the window to see her sitting next to the closed expen door "guarding it" until my return.
Sent from my iPhone using Petguide.com App