Doggy is a unique Construct in the Shadow-Cursed Lands in the service of the curse-bound child Oliver. Despite appearing as a Shadow and having similar abilities to a Shadow Mastiff, it is not considered an undead or a monstrosity.
It appears during the second game of hide-and-seek with Oliver, forcing the party to Hide and into Turn-Based Mode. The party either has to sneak their way into the ruined house where Oliver reappears in two turns or attempt to fight Doggy which is backed up by Mummy and Daddy.