Zeus drinks from the kitchen faucet in Otsego, Mich. The Great Dane, the world's tallest dog, died last week. He was 5. Kevin Scott Ramos/Guinness World Records 2013 Book/AP hide caption toggle caption Kevin Scott Ramos/Guinness World Records 2013 Book/AP The Two-Way Zeus The Great Dane, World's Tallest Dog, Dies September 12, 2014 His owner, Kevin Doorlag, told the Kalamazoo Gazette that Zeus died last week of old age. He would have turned 6 in November. On his hind legs, Zeus was 7 feet, 4 inches tall.