As our understanding of animal sentience and cognitive abilities continues to grow, so too does our responsibility to protect and promote their welfare and rights. The future of animal welfare and rights depends on:
Perhaps the final answer is not choosing one over the other. You can believe a pig has a right not to be confined in a crate (welfare) while also believing that we should eventually stop breeding pigs into existence for bacon (rights). You can hold that a chimpanzee has a right to bodily autonomy (ban invasive testing) while accepting that mice will inevitably be killed in grain harvesting. As our understanding of animal sentience and cognitive