Cerberus

Cerberus is a three-head monster as seen in chapter 444. However, this One Piece version of the Cerberus is very differant then the common one from the Greek mythology. The Cerberus' body is armored and snitched, the heads are tatooed. The Cerberus' heads are differant, the head on the right looks like a fox, the head at the top looks like a wolf, the head on left looks like a hyena.

Nami, Usopp and Chopper encounter this beast after being trapped at the bottom of the moat where they'er are bunch of skulls. They fleed from this beast after it chased them, they hid in the tree from the beast.