Just for the sake of perhaps this might come in handy for one of us..and taking the substantial risk of being labelled the biggest bullcrapper of all time, forfeiting any reasonable believability of future mudpuppy posts by my F series brethren, I humbly submit this experience for your use as a last resort, in an effort that it might save one of you a mauling...
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Back in the early 80's I found myself to be the caretaker of 17 grey wolves. They were housed 2 to a pen and the pens were in a circle with a wire enclosure all around.
Every day I would have to go in there to clean out the pens, I would open a door to a pen, step aside, and the male/female pair would run around in the main enclosure while I went into their pen and cleaned it out...then, you would walk out into the enclosure, and get away from their door and they would run back in there usually...usually...
The guy who owned the wolves told me it would happen and what to do WHEN I was attacked, so heres how you can actually disable/discourage or kill a big animal such as a wolf with your bare hands if needed.
When they come at you, offer them a forearm, make sure they clamp on it, with your other hand get a good grip on their lower jaw while falling over backwards in the same motion, lifting them off the ground. DO NOT let them plant their feet and shake, or in any way dilly dally trying to stay up on your feet, or get your arm out of their mouth, you want to try to choke them with the leverage you gained with your arm if you can, and draw them in tight to you, where you have even more leverage and strength, like an arm wrestler would do, see?....as you hit the ground with them on top of you, wrap your legs around their ribcage, lock your ankles together, and squeeze their chest as hard as you can with your legs. By exerting a twisting force on their lower jaw, and leveraging with the other, you roll them off you onto the side, then find an ear and bite it! The idea was to squeeze the air out of them and give them a good bite on their ear. They generally dont last long and start to pee and whine, and when you figure they are near the point of passing out, you can get up generally none the worse for wear if you are wearing a heavy long shirt or a carharrdt coat, you wont even get a scratch, a little bruising yes,..they will lay there whining, and heaving for breath...
They did this at least once per year to try to take your role as the "dominant male" of the pack, the rest were of course howling and going nuts and paying attention, so you dont want to lose or appear weak, or every one of them will want to have a go at you all the time.
I doubt this would work on something like a mastiff, their jaws are too short and by god are they thick, but for most any other dog like a shepard or doberman, rottweiler or
pitt,
should be no problem to kill them if you wanted to...it goes against all your natural instincts to get away, but it works if you can get in tight and control their mouth, jam your arm in there good so they cant get the leverage of their jaw muscles to deploy properly, and squeeze the air out of them. This is what you can do if you have no other options, and I dont know if it would work with more than one attacking you, seems the other wolf would never get involved when they saw what was going on, but sort of try to remember this when all else fails ...If you do this sometime, be sure to get a picture and post it here, or take the dogs collar for a trophy...

Mud