Many traditional breeds recognised by the main registries are said to be "purebred". Only individuals whose parentage consists only of other purebred examples of the breed are regarded as part of that breed. This concept has caused controversy both because of the difficulty of regulation and because of the possible genetic consequences of a limited population.
The list below uses a wide interpretation of "breed". Breeds listed here may be traditional breeds with long histories as registered breeds, rare breeds with their own registries, or new breeds that may still be under development. Please see individual articles for more information.
Dog breeds can be divided into different families, such as:
Dog breeds include:
Dog breeds may also be grouped into similar types such as pit bulls
See also: List of cat breeds