The Shadow Dog is one of the many Shadow Creatures that roam Greenvale. It is a gigantic doberman with hellish red eyes, incredible strength and speed. They generally roam the streets of Greenvale hunting those unfortunate souls caught out there in the dead of night.
The only character so far to encounter the Shadow Dog in the RP is Atlas. His search for plants to decorate his office with in Greenvale Forest Park led him to the Tree of Anna. He finds a bone there, but then the Shadow Dog ambushes him. Although it starts off normal sized, it grows almost to the size of the surrounding trees. Atlas only managed to escape by using the bone as a distraction and losing it in the trees.