My standard is around 7 months old and lately this has become a problem. He used to be an angel in the car, now he sometimes goes crazy with barking and growling at people if they walk by the car. Then I take him out at night he really doesn't like that at all and will bark if he sees anyone at all close. That one I kind of understand and as it is dark and hard to see. In the condo he is barking at many noises, and sometimes will bark when we are leaving the condo in the hallway and we see anyone at the end of my hall. I try to get him to sit when this happens, he doesn't listen or care at all and is way too overly excited to listen. He is good at parks with other people and dogs, and still goes to the dog park quite often, and it isn't a problem there. It feels like he is becoming possessive of " his space". I am not ok with this because I don't want him to become possessive of me. But not sure if I may be over reacting.