Interesting Behavior

My young black lab has been changing his attitude, not bad just different.
We recently moved to a little quiet town in the country away from the city and close neighbors. Everything seemed to be ok until he spotted our discreet neighbor. He's hardly ever home and basically out of our picture but Kipp doesn't like him. He growls, doesn't show teeth but stands his ground at the screen door. (Neighbor tucked to the left)
Kipp has never been aggressive but now he barks angrily, and he's started to hump me but not my kids.
Any insight would be appreciated.:thumbs up

i think he may be becoming a bit territorial over your new house, because a mean bark would keep most people away, espically with the growling, also humping is a sign of his being territorial, its like he is saying he owns you, so you should definately not let him do it..( which i am sure you dont ) and as for the barking, try and stop him and make him sit or do something for you and then walking him away from the window,door,etc where he is seeing the man walk by. hope this helps

Ummm...is he neutered? If not, that would explain a lot.