Gigantic Great Danes Personal Checks feature this German Mastiff breed in 4 different settings. Known as the 'Apollo of all Breeds' due to their great size, the Great Dane is one of the world's tallest dogs. The record holder is 43 inches tall. The most famous of all Great Danes is the fictional character of Scooby Doo. Another popular fictional Great Dane is Marmaduke from the comic strip by Brad Anderson.