Heidi has become a star of the zoo in Leipzig.

Denise Doorlag stands with Zeus, her Great Dane, at her home in Otsego, Mich., in this Nov. 3, 2011 photo. Zeus is now officially the world's tallest canine according to the Guinness World Record 2013 book. The 3-year-old measures 44 inches from foot to shoulder. Standing on his hind legs, Zeus measures 7-foot-4. (Kevin Scott Ramos/Guinness World Records 2013 Edition)