This happened to me once. A guy with two gun trained lurchers let his dogs on mine. We walk them quite late, aroun midnight to 1am as we had older dogs with weak bladders so with these pups its routine from that. He was obviously out poaching and was using the dogs to ward me off.
Stupidly I had a go at the bloke who was kitted up in his camo atire and stepped up to him and his dogs immediately went for me. I was waering my bike jacket at the time and the armour on my forearm protected me for the most part while I grabbed his dogs in an attempt to restrain them and then my dogs were trying to protect me by attackin his dogs while he just stood there.
I ended up booting all of the dogs, got min on a lead and just walked the other way as It hadn't occured to me of him possibly having a gun and that he might have had a mate in the woods he was waiting for.
I came away with a few nasty cuts on my hands and arm, still have some teeth mark scars. I sent the police down his way when I got home though and I haven't seen anyone since.
I can only begin to image what that dog did to that poor woman. Even in a playfight my dogs can hurt and scar, but they are only a vicious dog once highly provoked, which I have only witnessed that one time. Its bad enough for a dog to maul someone who deserves it, let alone an iccoent woman. I was lucky to have a bit of kevlar and thick jacket on my arms, she'll have scars for life.