You mean like this guideline that references the guide I sent you directly? Granted I had to fix the hyperlinking because the admin that put the rules page together huffs glue for a living.
12: Integrity of fluffies and their subspecies - This is first and foremost a forum about fluffies, and those who decide to make different or anthropomorphic versions of fluffies should be mindful of that.
Anthro-fluffies and fluffy subspecies should be easily recognizable as fluffies first and foremost via their appearance and behavioral patterns. Please see here for more details on what makes a fluffy pony. Failure to do so will result moderation un-listing the post in question from public view. Submissions that don’t meet the site’s standards for what constitutes a fluffy will be unlisted or removed at moderator discretion.