Ever since I got Brody, I have been unsure of how he would react to strangers. Because of this, when we are on a walk, I always have him sit off to the side when we see a person approaching. I do this in a calm, non-reactive way. Just, "oh, look, there's a person. ho hum. why don't you sit here and I will feed you a few treats as he/she passes". At first I would shorten his leash, not tight, but just so I could prevent anything from happening. Lately, I have not been doing this, but usually he just remains sitting until I say okay, or start to walk. A couple of times, he has moved towards the person as they walked away, but there was no contact. One time, we were on a sidewalk with a wall on one side and a busy street on the other. I saw two people approaching, one was pulling a small suitcase on wheels. I had Brody sit as usual, and all was fine until the man with the suitcase went past. Brody suddenly lunged towards the suitcase and snarled and growled at it. I pulled him back. No harm done. This morning we were walking along a familiar path that goes between two townhouse complexes. There are high solid fences on both sides. At the end of this path is the entrance to the school ground, and the path takes a sharp right. You can't see if anything is coming on the right because of the high solid fence, so normally I cinch up on the leash and take the corner wide so I can see what's coming before Brody does. I neglected to do this, and there was a tall man right there, dressed in black wearing sunglasses. Brody didn't bark or growl or give any warning, just followed the man as he passed, then nipped his backside! I was quite surprised. The man was angry (rightly so) and told me to control my dog and keep him on a short leash. I apologized, didn't yell at Brody, just made him sit before we moved on. Now I wonder if he would have done the same thing all those other times when he moved to follow someone. Has anyone with herding breeds had to deal with this, and is there anyway to prevent it? Will he outgrow it, or will I have to be so vigilant with him forever?