Mastitis in dairy herds is a worldwide problem, with significant implications for milk yields and quality, economic losses, and animal health and welfare. Effective control makes a considerable difference to the farmer and the animal, and this new edition includes updated information throughout as well as new chapters covering organic dairy herds, dry period infections, robotic milking, residue avoidance, and best practice procedures. The authors, both fellows of the Royal College of Veterinary Surgeons and recognised experts in the field, provide basic principles relevant to farmers, vets and veterinary students in a clear and practical way, covering anatomy, epidemiology, milking machines, disinfection, somatic cell counts, and diseases of the udders and teats in order to provide a thorough understanding of the causes of mastitis and measures of control and prevention. It is an indispensable resource for large animal vets, dairy industry personnel, farm managers, dairy herdsmen, and researchers and students in animal sciences and related disciplines.