When Ulix found the three-headed piglet surrounded by the corpses of the rest of the litter, he fondly named it Cerberus and locked it up in a shed. Having an ultra aggressive pig is only fun up to a point where you have to close your farm because it ate all the other animals. With time passing and the help of Penelope, Ulix was able to tame Cerberus enough so that it would follow his orders (most of the time) and even taught it a couple of tricks - though it refused to roll over and play dead, sadly. Now, Cerberus is one of the main reasons Gremlins and strangers don't linger aroung Ulix's farm for too long, except for that one incident where a demented young Gremlin called Orpheus thought he could lull in wild pigs by playing his banjo. Ulix actually welcomed Orpheus braking into Cerberus' sty for he learned that banjou music could be used to enrage pigs so much they entered a killing frenzy. And he got a free banjo.