I have a rescue dog that I believe to be a Rott. He passes for one but has a slightly longer muzzle. He certainly matches the characteristics. Absolutely love him. Big gentle loveable lug, protective but not in a dangerous way. Best dog I have had and I have had many.
I have had two Rotts from puppy to the end. My wife and I are trying to figure out how to get another one, because we both work all day. We Love these dogs.