If my dobe got anything other than super frinedly with a person living in the house there would be a huge problem. Is this your dog and he gets like this with you? I would put an end to it quickly and definately get him fixed. If he has been with you for a while that sounds totally unacceptable to me but soemone else may feel diffrently. I couldn't see my male doing that though and he's intact. Its not really an excuse to ahve them be more aggressive.