No, generally speaking, purebred British short-legged cats are healthy. They have short legs due to genes and bloodline. They are certified breed cats. However, as short-legged cats are recognized and liked by more and more people, some cat dealers and informal catteries will pair short-legged cats by themselves and breed them at will in order to obtain short-legged cats. This combination creates the British short-legged short-legged cat. There will be congenital diseases or developmental dysplasia, which is unhealthy.