An hour later, he went to the door, and I let him out.

The next day he was back, resumed his position  in the hall, and slept for an hour.  This continued for several weeks.

Curious, I pinned a note to his collar: "Every afternoon your dog comes to my house for a nap."

The next day he arrived with a different note pinned to his collar:

"He lives in a home with ten children -- he's trying to catch up on his sleep. Can I come with him tomorrow?"