Yes,Dog attacks can be very frightening,the worst scenario being if a Bull Terrier/Staffy type latch on and they lock their jaws and won,t let go.If this happens and you have your hands free you can actually grasp the dog round the throat and block its airways ,it's surprising how quick this happens.A friend of mine who had this happen to him employed these tactics to get it off,unfortunately for its owner he killed it.
I myself had to do this to my Terrier when it latched onto next doors Sheepdog,it was unconscious in only about 15 seconds,it did the job grand,by the way,that Terrier is laid in front of the fire snoring right now so the answer was no, didn't kill the little s..t, it soon came round.Hope you never have to do this but ' log it ' because take it from me,it works.