Dog distemper is caused by virus. It is an airborne type virus and can affect the respiratory, urogenital, gastrointestinal and central nervous system of dog. Dog distemper virus is closely related to measles in human and mostly affect puppies between 3-6 month of age, older dogs are less susceptible as the immunity build up in them. There exist a number of vaccines against dog distemper virus for dogs which in many jurisdictions are mandatory for pests