Are you planning to buy a tall dog breed? The Great Dane dog breed is your perfect choice. Its huge size, in terms of height and general body frame makes this dog famous. It has different names based on the dog's country of origin. For instance, German Mastiff or the Danish Hound is extra name for the same dog. Biologically, they group the Great Dane in the Canis lupus familiaris family. It is certainly the biggest domesticated dog you can find.