Dogs die hard. I have had the occasion to kill a few feral dogs when I was on active duty in Washinton State. I always went for the head shot, which was pretty easy since they were always up close and getting closer! When I walk my gentle giant Newfoundlands I always carry a 45 to protect them and my wife from the occasional Rottie, or Akita that sometimes roam the neighborhood. I had to warn an IDIOT once that his big dumb Akita had better not get loose while my family was in the area. This guy just loved scaring folks with his big mean dog. He stood in his front yard behind a three foot wall and smirked at me and said in heavily accented english: Yea...what-choo gonna do HESSE? He sounded just like a cartoon character or Cheech Marin. I politely told him that if his dog attacked my leashed dog and my wife and me, I'd have to very regretfully put a 45 caliber slug thru it's tiny brain. Then it was: REX!!! GET INSIDE!!! I never drew, never flashed the weapon....but this bozo had a neighborhood rep. I called the cops when I got home to go on record about his threatening mutt.
The one shot stop is ONLY a reality when the shot is cranio-ocular. Thru and eye or into the 4x6 cranial vault behind the forehead. That will reliably put anybody down. Making the shot is something else. Any old head shot won't do....what if you shatter a BGs jaw? I think that'd just make him mad.