Glossary

Purebred

A dog whose parents and ancestors belong to one recognised breed and are recorded in a registry, so its ancestry can be traced on paper.

Also called: pure breed, pure-bred, pedigreed dog, registered dog, papers

A purebred dog comes from parents of the same breed, and its lineage is recorded in a stud book kept by a registry such as the American Kennel Club. The paperwork shows who the parents and earlier ancestors were. That is all it proves.

Purebred does not mean healthy, well bred or show quality. A registered dog can come from parents that were never health tested, and a litter from a puppy mill can come with papers. Being purebred does give you a more predictable size, coat and general behaviour, because the breed was shaped toward a breed standard. It can also mean a narrower gene pool and breed-linked health conditions, which is why health testing of the parents matters.

A purebred is not a different species or a sign of better character. Many excellent dogs are mixed breed, and some purebred dogs are simply unregistered, with parents of the same breed but no papers.

Last reviewed November 8, 2026

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Related terms

Pedigree A written family tree of a dog showing its ancestors over several generations, usually with registered names, titles and sometimes health results. Kennel registry An organisation that keeps records of dogs and their parentage, issues registration papers and pedigrees, and often runs shows and sports. Mixed breed A dog whose parents are of different breeds or whose ancestry is unknown, often called a mutt. Breed standard The written description of an ideal dog of a breed, covering size, proportions, coat, colour, movement and temperament, used to judge dogs and guide breeding.