Great Dane
And the reason they are great is their sheer size. They can grow to well over 175 lbs, which is about the same as an average 6-ft. adult male. This in turn can be a good indicator of how much strength a Great Dane can pack in, which when unleashed can have devastating results. Image having to ward off a dog as big as a man and can inflict serious damage with its claws and bites.