A dog breed club is an association or club of fanciers of a single, specific breed of dog.
Breed clubs define the breed with which the club is associated in a document called a breed standard, although there may be multiple breed clubs for the same breed, each defining the breed in a somewhat different manner. Breed clubs are not scientific organisations, nor are breed standards meant to be scientific descriptions of a breed. Any fancier or group of fanciers may start a breed club and write definitions to suit themselves.
Dog breed clubs exist to "support the preservation and protection" of the club's breed. Each club defines for itself what exactly the club will do for the breed, depending on the use of the particular breed that is advocated by the breed club.
Breed clubs write the standard for their breed, and independent breed clubs maintain their breed's stud book (other breed clubs are affiliated with a national kennel club, which maintains the stud books of a great many breeds in a central location.)
Breed clubs provide information to the public about their breed. Club members agree to a code of ethics overseen by the club and a list of breeders is usually available to help people find a reputable breeder. Breed clubs also sponsor dog shows for their breed, hunting trials for their breed, and other events related to their particular breed.
Breed clubs promote the benefits and well-being of their particular breed and often offer events to discuss showing, training, breeding, and hereditary health issues. Clubs might also provide judging seminars to train dog event judges, and show clubs might maintain judging lists. Most breed clubs also schedule dog shows or competitions in various dog sports specifically for the breed, and raise funds for research on breed-specific health issues.
Breed clubs for agricultural stock breeds became popular social clubs in England in the late 18th century and early 19th century. The first breed club for chickens, for example, was formed in 1815 as an elite and expensive activity. By the mid-19th century, dog shows were becoming a pastime in Victorian England, and the bulldog was a popular pet. In order to make the bulldog breed smaller and more gentle, crossbreeding with pugs and other types of dogs was being done, leading to the formation of the first breed club, the Bulldog Club, in 1864, to write a breed standard to prevent what the members felt were undesirable changes to the breed. The club only lasted three years. More breed clubs were formed in England after the founding of the Kennel Club in 1873, starting with a new bulldog breed club in 1875 in London.