Animal virology is the science concerned with the study of viruses in animals. It is a sub-field of veterinary medicine. Several families of viruses are of particular interest in the study of animal virology, such as rhabdoviruses, pestiviruses, arteriviruses, toroviruses, coronaviruses, circoviruses, etc. Rhabdoviruses are a family of single stranded RNA viruses which can infect insects, fish and mammals. Notable examples of rhabdoviruses are rabies virus and vesicular stomatitis virus. Foot-and-mouth disease virus is a cause of foot-and-mouth disease in cattle, pigs, sheep and goats. Pestiviruses cause bovine viral diarrhea and classical swine fever. RNA viruses of the family orthomyxoviridae cause influenza in birds and mammals. This book includes some of the vital pieces of work being conducted across the world, on various topics related to animal virology. It studies, analyzes and upholds the pillars of animal virology and its utmost significance in modern times. It includes contributions of experts and scientists which will provide innovative insights into this field.