Read this excerpt from White Fang.Furthermore, it was remarkably easy to overthrow a dog taken by surprise; while a dog, thus overthrown, invariably exposed for a moment the soft underside of its neck—the vulnerable point at which to strike for its life. White Fang knew this point. It was a knowledge bequeathed to him directly from the hunting generation of wolves. So it was that White Fang's method, when he took the offensive, was: first, to find a young dog alone; second, to surprise it and knock it off its feet; and third, to drive in with his teeth at the soft throat.What motivating force causes White Fang to aim for another dog’s neck during an attack?