The study of the immune system is termed as immunology. Veterinary immunology is a branch of biomedical science which studies all the aspects of the immune system and activities in animals. It is closely related to veterinary science and zoology. The domain studies the relationship between body, pathogens and immunity of animal species. The malfunctioning and disorders in animal (non-human) bodies are of particular interest in veterinary immunology. It also studies how vaccines prevent diseases in animals and why do they cause adverse reactions in some situations. This book elucidates the principles and practice of immunology in animal species. It is a vital tool for all researching or studying veterinary immunology as it gives incredible insights into the emerging trends and concepts. This book will also provide interesting topics for research which interested readers can take up.