A guard dog is trained to attack on command. He should return to you when he doesn't like something himself and look into your eyes: "Should I rip this disrespectful thing into bits?" And you answer him: "Just bark at the moment."
It is a long way for you before your dog will be that obedient. At the moment any agressive behaviour must be disencouraged by recalls and treats for coming back. If you are training a guard dog - bother about his jaw muscles. War-of-tug must be his regular game, he must be responsive to your sweet voice, grab or relese it on command. Also feed him bones, a little but daily. The males start showing what they really are only after one year of age. You physically cannot train the guard dog on your own, while he is five, look for possible training places, find out what they do, and, if possibe, watch their handlers with dogs at work.
Last edited by David Taggart; 05-03-2013 at 12:38 PM.