Guinness: Arizona Great Dane is tallest dog ever February 23, 2010 at 12:58 PM CST - Updated June 15 at 8:30 PM TUCSON, Ariz. (AP) - A 250-pound blue Great Dane from Arizona gives new meaning to the term "big dog." Guinness World Records says Giant George from Tucson is the tallest dog ever on record. Guinness said Monday that he stands 3 feet, 7 inches tall from paw to shoulder, which is three-quarters of an inch taller than his closest rival - Titan, a white Great Dane from San Diego. The 4-year-old Titan took the title of world's tallest dog in 2009 after Gibson, a Great Dane from Grass Valley, Calif., died of bone cancer. Guinness officials say there were conflicting reports about Giant George's height, so they sent a judge to verify it. The 4-year-old is owned by David Nasser. Copyright 2010 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.