Alighieri reserved the third ring of hell for the glutinous. Immersed in an endless sea of trash, residents of the third ring are tortured/managed by the three-headed hellhound of Greek mythology, Cerberus.

I think my decision to use pigs to represent the glutinous is fairly obvious. Meanwhile the idea to make Cerberus a three-headed wolf was inspired by the classic relationship between the beasts (The Three Little Pigs).