Don't know a lot. Here is my sugestions. Do you have a gental leader for him?? If your out on a walk and someone comes up to you and you figure he'll end up barking or whatever. Stop and sit him beside you, and tell him to stay while your talking to the person. Use the gental leader to keep him there. Someone told me that once..don't know if it will work. Would it help maybe it the person made a fist and put their hand out slowly talking gentaly to him so he knows that they won't hurt you?? or would he think its someone trying to grab him?? or whatever lol.. i mean like put the fist below his head so he doesn't think its trying to hit him..sorry i dont knwo a whole lot..goodluck with it!