I am no attorney, but I played one in a high school play, but I would contact animal control (in writing) so you have a "claim/incident" on the record. Do you have a smart phone with video? Take it with you and record any aggressive behavior by this dog. I would also call the police and report the incident. I don't know where you live but aren't there leash laws in your area. Any dog owner that doesn't understand the liability they could face with this dangerous animal must be living in a cave. You are very lucky you weren't physically attacked. I believe they used Great Danes to hunt lions. I am nervous just being around one. Good luck!