The document discusses the Munchkin cat breed, which is known for having very short legs due to a naturally occurring genetic mutation. While early concerns existed that the short legs may cause spinal problems, studies of the breed in the 1940s and 1950s did not find this to be true. The short-legged trait is caused by an autosomal dominant gene, meaning there is a 50% chance offspring from Munchkin parents will also have short legs.