There are many viruses that affect the health of animals, and the field of study related to viruses in animals is known as veterinary virology. Some of these viruses have their own range and infect particular species. There are also some viruses which can affect different species. Veterinary virology focuses on the study of viruses like rhabdoviruses, foot and mouth disease viruses, circoviruses, herpes viruses and retroviruses. Rhabdoviruses are single stranded, negative sense RNA viruses inheriting six genera which infect a wide variety of plants and animals. Foot and mouth disease viruses are positive strand, non-enveloped, RNA viruses that can cause foot and mouth diseases in animals. Herpes viruses consist of ubiquitous pathogens which can infect both animals and humans. Retroviruses are a type of viruses that can cause cancer or immune deficiency. This book provides comprehensive insights into the field of veterinary virology. Its aim is to present researches that have transformed this discipline and aided its advancement. This book aims to serve as a resource guide for students and experts alike and contribute to the growth of the discipline.