Bitey

Bitey was the name given by the Eleventh Doctor to the Cybermat he encountered and caught in a department store. He gave it this name based on its organic mouth. He reprogrammed it to drain power from the Cyber-ship, but a Cyberman stepped on Bitey, destroying it. (TV: Closing Time)

The Doctor later wondered if the Cybermats of the Ninth Cyber Legion knew Bitey. (GAME: The Eternity Clock)