We have a shitzu here in the house and it barks TONS at strangers which is quite often. Everytime someone pass by our house, she barks out the window, lol. BUt she is so darn cute and smart!!!! I just have to give her a hug and pick her up for being so alert!! Very friendly if she knows you though. I can't imagine how many times I rough house with her. She loves to play, but never hurt a fly. She love nibbling on my finger, don't know why. Maybe it's salty? Dogs love salt.
I can't think of any dog that doesn't bark a lot besides labs. They are so gently, it's unbelievable. But they are big. Just look at their legs and paws when their pups. Seems like the smaller the dog, the more they bark....