When it comes to blows, remember:
If your fighting fair:
your tactics stink....
I have been attacked by dogs, two of them, when they set their mind to go for your throat, face, limbs, etc,... All bets end.
The only thing I had was a 4" Kershaw, used it, and I survived, while they bled and thought twice about the next round. (so did I but,...)..I don't even know if the dogs died or not, they got off me and some folks in a car pulled up to help.
Either way, there is more to the story than we know about, BUT someone sicks their dog on me, it is a life or death situation.
Pit Bull as well? That is a four legged lethal weapon, and yes I have known big baby pits, and Dobermans, and Rotts, and Shepards, that are all gentle and loving, but they can be like light switch with a type of owner that enables aggression in a breed of that type.