This is the first book to define the philosophical and practical parameters of critical animal studies (CAS). Rooted in anarchist perspectives that oppose all systems of domination and authoritarianism, CAS both challenges anthropocentrism and presents animal liberation as a social justice movement that intersects with other movements for positive change. Written by a collection of internationally respected scholar-activists, each chapter expands upon the theory and practice underlying the total liberation approach, the roles of academics and activists, and the ten principles of CAS. With apolitical animal studies and exploitative animal research dominating higher education, this book offers a timely counter-narrative that demands the liberation of all oppressed beings and the environment. Defining Critical Animal Studies will interest educators, students, activists, community members, and policy makers seeking accessible theory that can be put into action.