Pitbulls, golden retrievers, wolves--all technically the same species. The prejudice against certain breeds of "dog," or against "wolves," is no different from racism.
Pretty much. Imagine what it would be like to be born a wolf or a pitbull. If nature is stronger than nurture, what does that say about our own species? How likely is it that it's impossible to shape a wolf? Dogs came from them. It has to start somewhere; it's not a step function.