Tibbsy

 was a domesticated house cat who lived with Lloyd Collins in 1972. When the Twelfth Doctor warned Lloyd about dangerous "beasties" on Earth, Tibbsy attacked the Doctor. Lloyd explained that Tibbsy was not very good around strangers and, like Lloyd, always looked out for his family. The Doctor warned Tibbsy that he would be watching him. (COMIC: Moving In)

When Maxwell arrived home late because he was abducted aboard the Kolothos Hunt spaceship, he petted Tibbsy. (COMIC: Bloodsport)