One afternoon, I was in the backyard hanging the laundry when  an old,
tired-looking dog wandered into the yard. I could tell from his collar and
well-fed belly that he had a home. But when I walked into the house, he
followed me, sauntered down the hall and fell asleep in a corner. An hour
later, he went to the door, and I let him out. The next day he was back. He
resumed his position in the hallway 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."