Veterinary immunology focuses on the immune system of animals, emphasizing its role in health, disease prevention, and treatment. Like humans, animals rely on a complex network of cells, tissues, and molecules to defend against pathogens and maintain overall well-being. Understanding veterinary immunology is crucial for diagnosing and managing diseases in animals, as well as developing vaccines and therapies to enhance their immune responses. Key areas of study include immunological principles specific to different species, the development of immune-based diagnostic tools, and the interaction between nutrition and immune function. Advances in veterinary immunology contribute not only to the health of individual animals but also to broader issues such as animal welfare, food safety, and the prevention of zoonotic diseases that can affect both animals and humans. This book explores all the important aspects of veterinary immunology in the present day scenario. It is a compilation of chapters that discuss the most vital concepts and emerging trends in the field of veterinary immunology. As this field is emerging at a rapid pace, the contents of this book will help the readers understand the modern concepts and applications of the subject.