I would not be surprised if the dog shows up at his original owners place...maybe a couple of weeks..
I had a relative decades ago that had a summer place in Hamburg, NJ. Out in the sticks. Sunday afternoon came, time to go back to the city ..and no dog. They left for home.. Paterson, NJ . Their city house was a close neighborhood on the opposite side of the city from the country house. The distance was maybe 35 miles. The dog showed up at the house in Paterson 2-3 weeks later. I guess he had a Nose.

NB