This book explores how Paul Tillich’s systematic theology, focusing on the concepts of being and reason can benefit nonhuman animals, while also analysing how taking proper account of nonhuman animals can prove immensely beneficial. The author first explains the body of Tillich’s system, examining reason and revelation, life and the spirit, and history and the kingdom of God. The second section undertakes a critical analysis of Tillichian concepts and their adequacy in relation to nonhuman animals, addressing topics such as Tillich’s concept of ‘technical reason’ and the multidimensional unity of life. The author concludes by discussing the positive concepts in Tillich’s systematic theology with respect to nonhuman animals and creation, including the concept of universal salvation and Tillich’s interpretation of nonhuman animals and the Fall in Genesis.