Why not? Is it ethical to breed dogs for a particular trait? At least in this case it's done to further knowledge. Pigs are already being genetically humanized

Why not? Is it ethical to breed dogs for a particular trait? At least in this case it's done to further knowledge. Pigs are already being genetically humanized in order to enable pig to human organ transplant: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5287079/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5287079/ https://www.sciencemag.org/news/2017/09/scientists-grow-bullish-pig-human-transplants https://www.sciencemag.org/news/2017/09/scientists-grow-bull...