Completely updated and revised, and synthesizing the recent explosion in animal welfare literature, the sixth edition of this best-selling textbook continues to provide a thorough overview of behaviour and welfare of companion and farm animals, including fish. The introductory section has been completely revised, with all following chapters updated, redesigned and improved to reflect our changing understanding. This edition includes: - New and revised chapters on climate change and sustainability, ethics, and philosophy to ensure that the book provides the latest information in a changing world; - New information on human interactions with other animal species, big data, modern technologies, brain function, emotions and behaviour; - Solutions and advice for common abnormal behaviours. Written by a world-leading expert and key opinion leader in animal behaviour and welfare, this text provides a highly accessible guide to the subject. It is an essential foundation for any veterinary, animal science, animal behaviour or welfare-focused undergraduate or graduate course.