Dig Here Woof Woof No. 3

Dig Here Woof Woof No. 3 (ここ掘れワンワン3号, Kokohore wan wan 3-gō) is a scouting robot used by Child Emperor and the Hero Association to scout the way leading to Monster Association. They are sent into the tunnels left behind by Elder Centipede to look into the Monster Association's hideout.

Gyoro Gyoro manages to catch the robot and warn the rest of the Monster Association to prepare for the arrival of the S-Class heroes. Child Emperor is later seen thinking about losing contact with Dig Here Woof Woof No.3 and how he is close to discovering the exact whereabouts of the Monster Association.