The book is written in very simple way so that persons associated with veterinary profession can study and understand every aspects of the disease. For ease of understanding, the book has been divided into more than 20 chapters: Introduction, Etiology, Pathogenesis, Pathogen specific mastitis, Clinical signs, Symptoms, Diagnostic protocols, Treatment and Control. The highlights are: o multiple choice questions, fill in the blanks and true-false type of questions. o usefull in competitive examinations like ICAR, ICMR, CSIR, NET, JRF, ARS and examinations for admission in various degree programmes, merit scholarship examinations and appointment on various jobs where objective type questions are asked to evaluate the depth of the knowledge. o book has been meant for wide sources of information on mastitis of animals; however, it has also been designed to serve the purposes to guide undergraduate and postgraduate scholars of Veterinary science.