Short legs in cats are indeed caused by a genetic defect, but through several generations of breeding, the short-legged gene has been stabilized. Although the short legs are caused by a genetic change, the cat does not have any hereditary diseases. 
This breed of cat exhibits shortened or slightly curved long bones, but its spine remains unaffected, and its shape and flexibility are similar to other local cats. Although its limbs are short, this does not affect its running speed in the slightest.
Short-legged cats are surprisingly fast runners, and their rounded bodies make them very cute. When you own one, you'll find that it's very active and intelligent.
