Dog-people trust the instincts of their dog toward strangers. If the dog likes you, I will like you. If the dog allows you to hold the leash when two or more of us are on a walk, he trusts you. I will trust you. If the dog has a ‘skelly’ look ( misgivings) toward a workman in my home, I will keep a weather eye out. A couple of workmen who came to my home and we contracted to do work; the dog was very comfortable around another dog-person and so was I.