User blog comment:It-Freaking-Melts~11!!/New Characters for Sons of Neptune Decoded/@comment-86.185.239.69-20110904125309

And I'm pretty sure the shadow is of a wolf AND on the Disney Hyperion site, it says that "he has a certain flexibility in shape" AWESOME! Im guessing he can turn into one because often shapeshifters second forms appear as shadows behind them in posters and such.