I once was attacked by a rabid Timberwolf. They're like a combination af a pitbull and a Tazmanian Devil. As it lunged at me, preparing to sink its jaws into my neck, I changed levels to throw it off and momentarily stop its advancement.
It worked, but only for a split second, which was all the time I needed.
After drop stepping, I shot in and stood the insane animal up with a shoulder to the solar plexus area while securing an upper body lock around the chest area - like a bear hug.
As he growled, I squeezed tight and launched him backwards, falling into a neck bridge which caused his face to hit the concrete hard.
But he still had some fight in him, so I rolled to my back, pulled guard, and then brought my left leg up and trapped his right front leg. Then I pulled my shin under his mouth. With my shin across his throat, I yanked down on his massive head with all I had and choked him out.
A white and black Dalmation came to the scene and recorded the submission, forcing me to release the Gogoplata before I did permanent damage.
Man, I still get shivers thinking about it.