From Ardrana

Pig-cats are, as the name implies, the magically-created hybrid of a domestic pig and a feline. Their presence was first noted in eastern Arin about fifty years ago, and since then they have spread into Cardyl and eastern Hanaellan, especially in and around the city of Wilkarren.

It is not known who is responsible for the creation of this abomination, but some point to Keraptis, or at the very least someone in his employ.