Tired old dog?

[GMTII Owner]

An older, tired-looking dog wandered into my yard; I could tell from his
collar and well-fed belly that he had a home and was well taken care of. He
calmly came over to me, I gave him a few pats on his head; he then followed
me into my house, slowly walked down the hall, curled up in the corner and
fell asleep.

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

The next day he was back, greeted me in my yard, walked inside and resumed his spot in the hall and again slept for about an hour. This continued off and on for several weeks.

Curious I pinned a note to his collar: 'I would like to find out who the
owner of this wonderful sweet dog is and ask if you are aware that almost
every afternoon your dog comes to my house for a nap.'

The next day he arrived for his nap, with a different note pinned to his
collar: 'He lives in a home with 6 children, 2 under the age of 3 - he's
trying to catch up on his sleep. Can I come with him tomorrow?'