In 2006, Dave and Christie Nasser bought a Great Dane puppy. The runt of the litter, George soon began to dominate their world. From quivering misfit he grew into a gentle giant -- almost five feet tall and seven feet long. In 2010 George became a doggie superstar. Crowned Tallest Dog in the World by the Guinness Book of World Records, he's appeared on Oprah and has his own global fan club. But to Dave and Christie, George is still their much-cherished pet.