My 7.5 lb dog ignores the doorbell or a knock on the door, bark only once when startled, never pulls on its leash and sits and waits at a light before we cross.
He is very happy because he knows exactly what he can and cannot do.
Because he has such good manners he is allowed to go we us anywhere without restraints.
He also loves all people and will try to play with any sized dog, so much so that we have to keep him on a leash when a group of big dogs first gets together in the off leash area and until they burnt off their initial excess energy. One idiot "Professional" dog walker had no real control over his dogs and two of them had muzzles on and spent most of their time trying to get them off. When I first came into the dog area he threw his ball so that it landed right by my dog and his out of control greyhound slammed my dog. Thought this was an accident but a couple of days later when my dog  was racing around with another small dog, off in a corner, he did the same thing.