Isn't it sad what so called "humans" do to those who trust and love them? Dogs feel that their human beings only whant the best for them thus they do what we want them to. Consequently in this case another human might lose a leg or an arm! Incredible how sick people can be(come).
I really hope that the victim can be treated well and doesn't have to lose parts of her body.
And i hope that someone will care for the dog in order to train him how to behave correctly and not beeing any danger for other living creatures any more.
All the best
Michael