The Great Dane towers at an amazing 30-34 inches and weighs in at about 120-200 pounds. On its hind legs it can reach 6 feet tall. An amazing fact, the world's tallest dog is a Great Dane. His name is Giant George, with a weight of 245 pounds and a height of about 7 feet 3 inches on its hind legs. Don't let the massive look discourage you from these beautiful animals, as they can be very playful with children and show their owners a lot of love. This breed is called "the Gentle Giant" due to their charming nature.