One afternoon, a woman was in her back yard hanging the laundry when an old, tired-looking dog wandered into the yard. The woman could tell from the dog's collar and well-fed belly that he had a home. But when she walked into the house, the dog followed her, sauntered down the hall and fell asleep in a corner.

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

The next day the dog was back. He resumed his position in the hallway and slept for an hour. This continued for several weeks.

Curious, the woman 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: "We have ten children. He's trying to catch up on his sleep."