I got her from a pet shop (big mistake i now realise as she isn't good at all with being handled but she's gettin there), and they said she came from the breeder like that. I asked if there has ever been any blood in her cage, looked for scarring etc and there was nothing. She has no tail what so ever! Just a little round bum! She has very long back legs and carries her bum quite high which apparently is normal for a manx, so I reckon she is a genetic. I'll look out for toliet troubles but she seems to be fine so far. I wasn't planning on breeding her but thanks for all the advice 