My .02cents,
Some years back, I went to a friend's house. I hadn't seen him for about a year. His dog (rott) was sleeping on the couch next to the front door. My friend opened the door and then the screen door to let me in. We had been talking a good minute through the screen door with no reaction from the dog, but when my friend let me in and he reached out to shake hands...I was reaching out towards my friend's extended hand with my right hand..that Rott sprang out of that couch and chomped down on my forearm in a heartbeat. In the next second, he had shaken my arm while bearing down with his vice like jaw and teeth. I believe if I was a cat or rabbit, it would have snapped its neck.
Luckily, for me, I was into T'ai Chi and JKD trapping at that time, so I went with the shaking motions, but it had my strong arm! I immediately went into eye jab/rake with my left hand, then throat jab with open hand. I locked on into a one hand strangle around it's adam's apple?
The dog continued to shake it's head from side to side...This was dog fu to it's dirtiest!! Then it loosened its grip just a little and I kind of pulled my arm back with my free left hand.
Even in judo,jiujitsu, and hapkido, I have never experienced such a quick and violent attack in such a short time. I believe if I had stood my ground and tried to defend with muscle strength, I would have deep puncture wounds and lacerations if not broken bones and torn tendons.
Just then, my friend jumped in and grabbed his dog around the neck with his arm. Thus separating the two of us. I stepped back out of the screen and front door and shakily said, "Maybe we can get together some other time, when it's more appropriate."
I had my foot firmly against the door in case the dog wanted to have another go.
All my friend could say was that "his dog had never done that before...and that he was sorry."
I immediately washed my arm with a garden hose and went to my nearby hospital to get my arm patched up and x-rayed.
True story.
I don't think I couold have gotten to my folder if I had one because it was on my dominant hand side. I carry two now.