The broadest subject headings to use are Animal Welfare and Animal Rights. Among narrower terms that focus on some specific dimension of the problem are Animal Experimentation--Moral and Ethical Aspects, Animal Testing Alternatives, Human-Animal Relationships, Zoo Animals, Zoos--Philosophy, Vegetarianism, Veganism, Vivisection, and Factory Farms. Remember always to check the subject headings in any relevant book you find to see if it contains other potentially useful subject headings to search under.
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