I just want to make it clear, Harley is far from being aggressive. He is fearful of certain situations, uneasy around things. Having a high drive does not make a dog aggressive, just a little harder to work with.
I really do not know how to explain it really well, when he hears kids outside on a walk, tension grows, body language tells me he is uneasy around that situation.
His posture becomes stand offish, looking back and forth trying to figure out where and when kids are coming.
I stay far away from parks on weekends, stresses him out too much.
He has never lunged at a child, but if given a chance I know he would run them down, what would happen next I do not know, nor do I ever want to find out.