He likes treats, he helps patients relax at the doctor's office, and now he's the world's tallest living domestic cat. Fenrir Antares Powers, a two-year-old Savannah cat, measured 18.83 inches on Jan. 29, 2021. His record was published in the Guinness World Records 2023 edition. Savannah cats like Fenrir are crosses between domestic cats and large-eared wild African cats, according to the International Cat Association. Fenrir's owner is Michigan physician and HIV specialist Will Powers, the website said. Powers adopted him when he was just 12 weeks old. "He just grew and grew like Clifford the Big Red Dog," Powers said in a video about the kitty. Visit the link in bio to learn more about the tallest cat. 📸: Guinness World Record