A pet cat named Fenrir Antares Powers, which lives in US' Michigan, has been confirmed by the Guinness World Records as the world's tallest living domestic cat. Fenrir measures 47.83 cm (18.83 in). Fenrir is the brother of Arcturus Aldebaran Powers, who formerly held the record before passing away. Arcturus measured in at 48.40 cm (19.05 in).