Speciesism — differential treatment based on species membership — is challenged by animal ethics philosophers as an unjustifiable bias. Understanding the debate about speciesism helps clarify the foundations of animal welfare ethics.
The speciesism critique is both philosophically important and practically useful for animal welfare advocacy. It highlights the inconsistency of moral frameworks that accord strong protection to dogs and cats while permitting intensive farming of pigs and chickens with comparable or greater cognitive complexity. It also exposes the cultural and historical contingency of our current moral circle. Engaging with speciesism arguments helps advocates move beyond case-by-case species advocacy toward a more principled framework for extending moral consideration consistently based on sentience and capacity for suffering.