My 4 month old has started barking at some strangers when we are out walking. Or like the other day she barked at my mom when we got out of the car to walk into their house. It is several bark... bark... barkbarkbark type barks. With hackles up. Weird part is that the other night at halloween we went to a very crowded area, tons of people, tons of dogs, costumes etc and she didn't bark at a single person. No hackles. Just happy go lucky demeanor. So I am confused. Why sometimes and not others? How should I address it? I have used treats to divert her attention but I also don't want it to seem like I am giving her a treat for barking at the person. I just want to make sure I deal with it appropriately.