^
- With my Border I could put him in the truck, with the side windows fully down and the slider to the bed wide open, tell him to 'stay' and he'd go to sleep.
But when we still had the house, and our neighbor's homes were a little distance apart, he'd (we this learned from a neighbor who said "You were out last night") howl right up until he heard our vehicle approaching, so that by the time we rolled down the drive, the place was silent. Guess he figured we'd abandon the house but not the vehicle.
- Similarly, we followed another pack of African Wild Dogs on a hunt, and learned that they often leave the younger ones who can't keep up, and then notify them when the kill is made.
We parked near the young ones who'd been left behind, and who were totally unconcerned......they slept until a howl told them to "Come and get it", and we were all off and running.
So, I guess it's the perception of separation, rather than the physical apartness, that has the most impact.