In 1999, the American Curl became the first breed admitted to the Cat Fanciers' Association (CFA) Championship Class with both longhair and shorthair divisions.

[4] The American Curl is a medium-sized cat 5–10 lb (2.3–4.5 kg), and does not reach maturity until 2–3 years of age.

Both longhaired and shorthaired American Curls have soft, silky coats which lie flat against their bodies.

The American Curl, while still an uncommon breed, is found across the world in the United States, Spain, France, Japan, Russia, and many other countries.

[5] The question arises if homozygous curls (CuCu) could also be affected by cartilage formation defects and bone abnormalities.