Surprised at your unlikely scenario, given that the number of postmen currently reporting dog injuries is at an all-time high..!! I love all animals, but if attacked I'd have no hesitation in fatally injuring a mad dog in self-defence - but then I'd take the greatest pleasure in sueing a huge amount of money out of the smelly, tattooed, beer-swilling, couch-potato slobs who usually own the world's unhappiest dogs, as a lesson for their miserable, inexcusable failure to feed, clean, train or exercise the poor animals properly.