Animal diseases can be caused by a variety of pathogens, such as bacteria, fungi, viruses, etc. Some bacterial diseases are anthrax, diphtheria, Lyme disease, salmonellosis and rickettsioses, while fungal diseases include aspergillosis, blastomycosis, candidiasis and dermatophytosis. Animals are susceptible to genetic diseases, such as complex vertebral malformation, hyperinsulinism hyperammonemia syndrome, foal immunodeficiency syndrome and hyperkalemic periodic paralysis, among others. The field of veterinary medicine is concerned with the diagnosis, treatment and prevention of all veterinary diseases. The diagnosis of disease is possible through an examination of body fluids and animal tissue. This is under the scope of veterinary pathology. It may be further divided into anatomical and clinical pathology. Anatomical pathology deals with the diagnosis of disease based on a microscopic, molecular and gross examination of organs, tissues and whole bodies. The diagnosis of disease through a laboratory analysis of bodily fluids, such as urine, blood or cavitary effusions is under the scope of clinical pathology. Some common interventions to achieve good animal health include vaccination against animal diseases, such as rabies, dental prophylaxis, etc. Specialties in veterinary medicine include areas like anesthesiology, cardiology, dermatology, dentistry, etc. This book outlines the diagnosis, treatment and prevention of veterinary diseases in detail. It will help the readers in keeping pace with the rapid changes in veterinary science and medicine.