When you stud to another king you see the following text

"* Breeding to a mutated stud does not affect your chances of conceiving a mutated cub unless the stud is a variation of piebald or primal. " (http://prntscr.com/pn8j1w)

However with the introduction of Primal Fangs, this text is not strictly true, based on the news post from September:

* Primal Fangs cannot pass naturally
* Primal Fangs can pass using a Lion Scrotum
* Primal Fangs can appear in any Primal variation-type breeding that failed any Primal pass
* To elaborate, Primal Fangs can be passed down from any Primal variation father (regular Primal, Felis, Ferus, and Smilus) and from a Primal (Ferus) mother
* Primal Fangs can be posed!

I'm basically just suggesting that the text be ever so slightly altered to make it clear that Fangs will not naturally pass from Fangs; as it is a 'fail' mutation from the other Primal variations.