The ball dog is one of the shikigami used by Megumi Fushiguro.
One of the shikigami summoned through shadows in Fushiguro Megumi's technique "Decathlon". It looks like a dog and has a pattern engraved on its forehead. You can call it by making a shadow picture of a dog by hand. There are two types, "white" and "black". It is mainly used to detect curse power by using a sharp sense of smell. Two shikigami dogs are given to the users of the Decathlon method first, and it seems that the number of shikigami on hand will increase by subduing the other shikigami. Initially, there were two Fushiguro ball dogs, but "White" was destroyed by a special-grade spell in the work, and later "Black" took over the ability, with a large body reminiscent of a wolf and sharp claws. It has evolved into a "dog" with.