I saw a show once where the dog was watched on camera in a home in a suburb/urban area and that dog would be just laying about doing what it did when alone, but as soon as the owners car got within a distance of the house the dog perked up went to the door and sat waited for the owner.Don’t know for sure. He was fine with the mail man when he came to the door to deliver packages. We know the mail man. Same guy every day, typical small white mail jeep. White FedEx van, different drivers, bigger than the mail jeep. But the UPS van, big. Brown.
He was a stray. Literally showed up on the back porch. He was about 9 months old. First time we gave him a treat he freaked out. No idea what his background was but probably not great. He lived to be about 16 years old. Best dog I ever had. Plus he protected us from brown.
They also demonstrated that this occurred when the owner came home at random times…