In this objective, practical and authoritative introductory text the author reveals how the fundamental principles of the human-animal relationship drive the development of animal law. The book explains the criteria by which the lawful use of animals is determined, and how these criteria impact evolving standards of animal protection and define the responsibilities of people in their interactions with animals. The author identifies 29 key principles which constitute the core knowledge necessary for people involved in debating, assessing, and guiding the evolution of society’s national and international rulebook of animal welfare law. The book also considers animal welfare and law in the context of a global market through discussion of common issues such as climate change, biosecurity, food safety and food supply. Based on successful law courses run by the author and his own expertise as an animal law lecturer, prosecutor and specialist legal adviser, the book combines insights from science, ethics and law to provide an essential understanding of what informs society and the law with regards to animals and their welfare.