Mythical Dog Trio Picture

This is a drawing of my three favorite mythical dogs. The dog with one head is Garm; The dog with two heads is Orthos; and Cerberus is the dog with three.

Orthos and Cerberus are brothers but Garm is not. He's from Norse mythology.
Hector
Kerberos (Animated Gif)
Mythical Dog Trio
Ceberus
Drakonhound