The Mini Rex is a comparatively young breed, the product of deliberate American rabbitry in the 1980s rather than centuries of folk development. Its defining feature, the dense upright velvet coat, traces back to a spontaneous genetic mutation discovered in standard Rex rabbits in France around 1919. That recessive coat gene, which causes the guard hairs to shorten to roughly the same length as the undercoat, gives Rex rabbits their distinctive plush texture and would later become the foundation of the miniature version.
The Mini Rex itself is credited to Mona Berryhill of Texas, who in 1984 crossed a small dwarf-type rabbit carrying compact size with a Rex carrying the velvet coat. The goal was to capture the luxurious Rex fur on a much smaller, more manageable companion-sized body. Through careful selection she stabilized a line that bred true for both the size and the coat.
Recognition followed quickly. The American Rabbit Breeders Association accepted the Mini Rex as a distinct breed in 1988, and from there it spread rapidly through the show and pet markets. Its swift rise reflected a combination of an appealing coat, a gentle disposition, and a size that suited apartment and indoor living.
Unlike many livestock-derived breeds, the Mini Rex was bred from the outset with companionship and exhibition in mind rather than meat or fur production. That intent shaped a breed prized for temperament and appearance, and it remains one of the most popular rabbits at shows and in homes across North America.