Purebred in the context of "List of horse breeds"

A black cat is a domestic cat with black fur. They may be a specific breed, or a common domestic cat of no particular breed. Most black cats have golden irises due to their high melanin pigment content. Black cats are the subject of mythology, legend, and superstition. They are often associated with witches and good or bad luck in European folklore.

The Cat Fanciers' Association (CFA) recognizes 22 cat breeds that can come with solid black coats. The Bombay breed is exclusively black.

A crossbreed is an organism with purebred parents of two different breeds, varieties, or populations. A domestic animal of unknown ancestry, where the breed status of only one parent or grandparent is known, may also be called a crossbreed though the term "mixed breed" is technically more accurate. Outcrossing is a type of crossbreeding used within a purebred breed to increase the genetic diversity within the breed, particularly when there is a need to avoid inbreeding.

In animal breeding, crossbreeds are crosses within a single species, while hybrids are crosses between different species. In plant breeding terminology, the term crossbreed is uncommon, and no universal term is used to distinguish hybridization or crossing within a population from those between populations, or even those between species.

A moggy is any cat which has not been intentionally bred. Moggies lack a consistent appearance unlike purebred cats that are selectively bred for appearance conforming to a standard. In contexts where cats need to be registered—such as in veterinary practices or shelters—moggies may be called domestic short-haired (DSH) or domestic long-haired (DLH) cats, depending on coat length (and less common designations may include "domestic medium-haired (DMH)" or "domestic semi-long-haired").

The term racial hygiene was used to describe an approach to eugenics in the early 20th century, which found its most extensive implementation in Nazi Germany (Nazi eugenics). It was marked by efforts to avoid miscegenation, analogous to an animal breeder seeking purebred animals. This was often motivated by the pseudoscientific belief in the existence of a racial hierarchy and the related fear that "lower races" would "contaminate" a "higher" one. As with most eugenicists at the time, racial hygienists believed that the lack of eugenics would lead to rapid social degeneration, the decline of civilization by the spread of inferior characteristics.

Like eugenics, racial hygiene was largely discredited and abandoned following World War II.

The Thoroughbred is a horse breed developed for horse racing. Although the word thoroughbred is sometimes used to refer to any breed of purebred horse, it technically refers only to the Thoroughbred breed. Thoroughbreds are considered "hot-blooded" horses that are known for their agility, speed, and spirit.

The Thoroughbred, as it is known today, was developed in 17th- and 18th-century England, when native mares were crossbred with imported stallions of Arabian, Barb, and Turkoman breeding. All modern Thoroughbreds can trace their pedigrees to three stallions originally imported into England in the 17th and 18th centuries, and to a larger number of foundation mares of mostly English breeding. During the 18th and 19th centuries, the Thoroughbred breed spread throughout the world; they were imported into North America starting in 1730 and into Australia, Europe, Japan and South America during the 19th century. Millions of Thoroughbreds exist today, and around 100,000 foals are registered each year worldwide.

Boar–pig hybrid is a hybridized offspring of a cross between the Eurasian wild boar (Sus scrofa scrofa) and any domestic pig (Sus scrofa domesticus). Feral hybrids exist throughout Eurasia, the Americas, Australia, and in other places where European settlers imported wild boars to use as game animals. In many areas, a variable mixture of these hybrids and feral pigs of all-domesticated original stock (even environmental, agricultural, hunting, and other regulatory agencies often do not bother distinguishing between them) have become invasive species. Their status as pest animals has reached crisis proportions in Australia, parts of Brazil, and parts of the United States, and the animals are often freely hunted in hopes of eradicating them or at least reducing them to a controllable population.

When bred intentionally, the hybrid is intended to visually recreate‍—‍to "back-breed"— the look of pigs represented in prehistoric artworks of the Iron Age and earlier in ancient Europe. A project to create them, under the name Iron Age pig, started in the early 1980s by crossing a male wild boar with a Tamworth sow to produce an animal that looks like the pig from long ago. Iron Age pigs are generally only raised in Europe for the specialty meat market, and in keeping with their heritage are generally more aggressive and harder to handle than purebred domesticated pigs.