A pig-human is a life form and most evolved persons would respect them as sentient beings, assuming they were not a threat. Buddhists believe there is no "us" and them. We are all part of the Earth's biotic community and are interdependent. We need oxygen and plants provide that along with energy in the form of food.
Where we draw the line between pig and man is defined by DNA differences. As I see it, each individual is a unique species characterized by their unique DNA pattern. Even identical twins are 2 different species because their exactly similar basic genomes are offset by the differences in their epigenetics. A big unifying factor is replicating with other humans. This is where we begin to form a perception of "us" being a species and working toward the well being of our tribe.