Motorized Universal Technology Terrier (M.U.T.T.) is Professor Brickkeeper's robot dog. The acronym M.U.T.T. is a pun on mutt, a type of dog. The robot dog is purposely sized to be to scale with Professor Brickkeeper, yet still made of LEGO bricks. Apparently, M.U.T.T. was quite the terror before he was house broken. According to Brickkeeper, he once took control of a toy tank just to break into the cabinet where his treats were kept.