A breed standard (also called bench standard or standard of points) in animal fancy and animal husbandry is a set of guidelines which is used to ensure that the animals produced by a breeder or breeding facility conform to the specifics of the standardized breed.
Breed standards are devised by breed associations or breed clubs, not by individuals, and are written to reflect the use or purpose of the species and breed of the animal. Breed standards help define the ideal animal of a breed and provide goals for breeders in improving stock. In essence a breed standard is a blueprint for an animal fit for the function it was bred - i.e. herding, tracking etc. Breed standards are not scientific documents, and may vary from association to association, and from country to country, even for the same species and breed. There is no one format for breed standards across all species, and breed standards do change and are updated over time.
Contents of a breed standard
Breed standards cover the externally observable qualities of the animal such as appearance, movement, and temperament. The exact format of the breed standard varies, as breed standards are not scientific documents and change as the needs of the members of the organization which authors them change. In general, a breed standard may include history of the breed, a narrative description of the breed, and details of the ideal externally observable structure and behavior for the breed. Certain deviations from the standard are considered faults. A large degree of deviation from the breed standard, an excess of faults, or certain defined major faults, may indicate that the animal should not be bred, although its fitness for other uses may not be impeded by the faults. An animal that closely matches (conforms to) the breed standard for its species and breed is said to have good conformation.
A breed standard (also called bench standard or the standard) in the dog fancy is a set of guidelines covering specific externally observable qualities such as appearance, movement, and temperament for that dog breed. Breed standards are not scientific documents, but are written for each breed by clubs of hobbyists called breed clubs for their own specific requirements. Details and definitions within breed standards for a specific dog breed may vary from breed club to breed club and from country to country. Dog breed standards are similar in form and function to breed standards for other domesticated animals.
Content and purpose
The breed standard for each breed of dog is distinct, giving a detailed "word picture" of the appearance and behaviour of an idealized dog of that breed. Included in the breed standard description are externally observable aspects of appearance and behaviour that are considered by the breed club to be the most important for the breed, and externally observable details of appearance or temperament that are considered by the breed club to be unacceptable (called faults). In addition most breed standards include an historical section, describing the place of origin and the original work done by the breed or its ancestor types.