Great Dane, breed of working dog developed at least 400 years ago in Germany, where it was used for boar hunting. The Great Dane is typically a swift, alert dog noted for courage, friendliness, and dependability. It has a massive square-jawed head and body lines that give it an elegant appearance. Its short coat is black, fawn (golden brown), brindle, blue-gray, harlequin (white with black ...