This is been in the air for a while now. Jack is not totally onboard with letting anyone submit the MW characters afterwards, as he doesn't want them being submitted in certain scenarios he wouldn't like (I.E something that'd go against their character).
So either he has to approve submissions beforehand, or he just outright denies them altogether. We'll have to wait til the far far future to find out.
He has mentioned in the past about possibly doing a Claire/Dog animation himself, so don't go thinking they're 'safe' from other kinks

do remember he has animated Rebecca's daughters with the horses before. And Becca herself (at least another version of her) has played with plenty of creatures