The Cornish Rex is a breed of domestic cat. The Cornish Rex has no hair except for down hair. Most breeds of cat have three different types of hair in their coats: the outer fur or "guard hairs", a middle layer called the "awn hair"; and the down hair or undercoat, which is very fine and about 1 cm long. Cornish Rexes only have the undercoat. Occasional individuals are prone to hair loss or will develop a very thin coat or even go bald over large parts of their body. The curl in their fur is caused by a different mutation and gene than that of the Devon Rex. The breed originated in Cornwall, Great Britain.

The Devon Rex is a tall-eared, short-haired breed of cat that emerged in England during the late 1950s. The breed is known for its atypical appearance, with an oddly shaped head, large eyes, and the short and wavy coat.