A viral disease or infection is an infectious disease which occurs due to the invasion and proliferation of infectious viruses. Identification and control of these viruses that cause diseases in domesticated and wild animal represent continuous challenges to animal and human welfare. A lot of diagnostic techniques like biochemical tests and behavioral tests are used for the detection of viral diseases. Discovery of new techniques and technologies in this field has resulted in accurate understanding of diseases in less time with high accuracy and efficiency. The treatment of veterinary viral diseases depends upon the nature and uniqueness of the virus. The treatment usually follows the medical advice of veterinarians and the use of veterinary drugs specific to viruses and animals. This book provides comprehensive insights into the field of veterinary viral diseases. It discusses the fundamentals as well as modern approaches of diagnosis and treatment of veterinary viral diseases. Researchers and students in this field will be assisted by this book.