a fearful dog, IMO, would come to you for comfort, not place himself in between you and whatever he percieved as the threat. Wally is definately a valiant Grey hound
My Oscar came to my defence when I had an altercation with my landlord. I asked the landlord to leave, and he would not (my roomie had not payed her 1/2 of the rent and we had a heated argument etc etc etc), I attempted to push him out my door, he pushed back, and stomped on my shoeless feet several times(this is a older, maybe 50-60 yr old man). When I realized that the whole shoving match was going no where, I called Oscar, he came around the corner, barked once, and as the man backed into the corner-after he saw the dog- he jumped up on him(his head about level with the man's), I told him enough, he stopped, I put him in a down in the hallway so the man couldn't go anywhere, and dialed 911. A policeman came, and low and behold, my landlord stepped back over the threshold of my doorway when he saw the Officer.
Oscar got many extra pets that day, and later I brought him back to the door and treated him several times. He did not bite, he didn't even growl, he knew the man was already afraid of him and only did what was necessary, he was my little(well, kinda big,
) knight in shining armor.
I have only seen a few people he truly did not like throughout his entire life, (3, maybe 4?) and even then his reaction is only reservation and indifference. I always wonder what horrible people they must be, for my dog not to like them...