What Is Animal Ethics?

Question

What is animal ethics, and why does it occupy such a contested place in contemporary moral philosophy? The question matters because it forces a confrontation between our moral ideals and our ordinary practices: most people believe that cruelty is wrong, yet industrialized societies routinely cause enormous suffering to animals in the pursuit of food, fashion, science, and entertainment. Animal ethics asks whether these practices can be defended, and if not, what follows.

Quick Answer

Animal ethics is the philosophical study of the moral status of nonhuman animals and of our obligations toward them. Its central question is whether animals have moral standing — whether their interests count morally in their own right, or only insofar as they affect human interests. The two most influential answers are utilitarian and rights-based. The utilitarian answer, developed by Peter Singer, grounds moral consideration in the capacity to suffer: if a being can suffer, its interests count equally with the comparable interests of any other being, regardless of species. The rights-based answer, developed by Tom Regan, grounds it in the status of animals as "subjects-of-a-life": beings with a welfare of their own have inherent value and rights that set limits on how they may be used. A third line of thought — the virtue-ethical — asks not what animals are owed but what kind of people we become by how we treat them.

Historical Wisdom

The Western tradition has mostly denied animals full moral standing. Aristotle placed animals below humans in the natural hierarchy, and his influence — through Aquinas and the scholastics — made the denial of animal rights a theological as well as a philosophical position. Descartes radicalized the tradition by denying that animals have minds at all, treating them as machines whose cries were mere reflexes. Kant located moral standing in rationality and therefore denied animals direct duties, though he insisted that cruelty to animals is wrong because it hardens the heart toward humans. The turning point came with the utilitarians: Jeremy Bentham asked the question that still frames the debate — "The question is not, Can they reason? nor, Can they talk? but, Can they suffer?" — and John Stuart Mill, also a utilitarian, included animals within the scope of the greatest happiness principle. The Indian traditions, by contrast, had long given animals a prominent place: Jainism's ahimsa (nonviolence) extends to all living beings, and Buddhism's first precept prohibits taking life.

Philosophical Perspectives

Peter Singer's Animal Liberation (1975) is the founding text of contemporary animal ethics. Singer's argument is disarmingly simple. The basic principle of equal consideration of interests — the foundation of utilitarian ethics — does not require that we treat all beings alike; it requires that we give equal weight to equal interests. A dog's interest in avoiding pain is as strong as a human's comparable interest, and the fact that the dog is not human is as morally irrelevant as the fact that a person is not white. Singer coined the term "speciesism" to name the prejudice against nonhuman animals, drawing an explicit parallel with racism and sexism: in each case, a morally irrelevant difference (skin color, sex, species) is used to justify differential treatment. On this basis Singer condemns the practices of factory farming and animal experimentation, which inflict suffering on beings with an equal interest in avoiding it.

Tom Regan's The Case for Animal Rights (1983) argues from a different foundation. Regan rejects the utilitarian calculation — which could in principle justify sacrificing animals for a greater total good — and argues instead that animals are "subjects-of-a-life": beings who have a welfare of their own, who can fare well or ill, and who therefore have inherent value. Beings with inherent value have rights, and rights set side-constraints: they cannot be sacrificed merely to benefit others. The practical consequence is abolitionist: animal agriculture and animal research are not practices to be regulated but wrongs to be ended, because they use beings with rights as mere means.

A third approach, developed by philosophers such as Rosalind Hursthouse, draws on virtue ethics: the question is not what animals are owed but what dispositions we should cultivate. Cruelty is a vice and compassion a virtue, and the treatment of animals is a test of character. This approach avoids some of the theoretical difficulties of utilitarianism and rights theory, and it connects animal ethics to the wider question of how we should live. Feminist care ethicists add another dimension: the ethics of care, with its emphasis on attentiveness and response to particular others, extends naturally to the animals with whom we share our lives.

Lessons From Thinkers

The lessons of animal ethics are these. From Bentham: the capacity to suffer, not reason or language, is the criterion of moral consideration. From Singer: consistency demands that we take the interests of animals as seriously as we take comparable human interests — and consistency has practical consequences for what we eat and what we fund. From Regan: some uses of animals cannot be made right by better conditions, because the use itself violates their rights. From the virtue ethicists: how we treat animals is a measure of who we are. And from the critics: the philosophical arguments must be tested against practical realities — the feasibility of large-scale change, the interests of humans who depend on animal agriculture, and the relationship between animal ethics and environmental ethics, which sometimes conflict (for example, over culling and predation).

Practical Application

Animal ethics has direct practical implications. In food ethics, it raises questions about factory farming, meat consumption, and the alternatives of plant-based and cultivated foods. In research ethics, it questions the justification of animal experimentation and the conditions under which it might be permitted. In entertainment, it challenges circuses, zoos, and blood sports. In law, it has motivated the recognition of animal sentience and, in some jurisdictions, the classification of animals as sentient beings rather than property. In daily life, it asks us to examine the practices we take for granted — from what we eat to what we wear — and to bring them before the standard of equal consideration. The practical lesson is that animal ethics is not an abstract debate: it is a question that every meal answers.

Quotes

Bentham's question, from An Introduction to the Principles of Morals and Legislation (1789), is the founding sentence of animal ethics: "The question is not, Can they reason? nor, Can they talk? but, Can they suffer?" Singer's conclusion follows directly: "The capacity for suffering and enjoyment is a prerequisite for having interests at all." And Regan's rights claim is stated in The Case for Animal Rights: "Animals are not our tasters, not our test subjects, not our tools — they are our fellow creatures, subjects of their own lives."

Related Questions

• What Is Environmental Ethics? — examines the wider question of our duties to nature.
• What Is Utilitarianism? — situates Singer's argument within the utilitarian tradition.
• What Is Compassion? — explores the emotional basis of extending moral concern to animals.
• What Is Peter Singer's Expanding Circle? — explains the widening of moral concern in Singer's thought.