Found this out on the hunter forums (give credit to aethien), if you go to the wetlands and have ur pet tank this http://wow.allakhazam.com/db/mob.html?wmob=1158
mob, it will eventually lay a curse on ur minion. This curse transforms your pet into a zombie, male or female depending on the gender of your minion. In any case, i have a cross dressing minion, yuck. I might have to re-roll as a lock to get a female succubus. I just can't stand the thought of a guy in a leather corset+whip +combat boots.
My advice to you is not to try it. You might regret it.