What is the common way to distinguish the Manx cat because of the cat body-type mutation?
Manx cat: The Manx cat ( , in earlier times often spelled Manks), is a breed of domestic cat ("Felis catus") originating on the Isle of Man, with a naturally occurring mutation that shortens the tail. Manx cat:  Many Manx have a small stub of a tail, but Manx cats are best known as being entirely tailless; this is the most distinguishing characteristic of the breed, along with elongated hind legs and a rounded head. Cat body-type mutation: Cats, like all living organisms, occasionally have mutations that affect their body type.
tailless