I have a 7 year old neutered male dobe. I have had him since he was a puppy and he has never so much as growled at a human before. He was very excitable until age 3 and has since calmed down to the point of being very chill at all times and is now very indifferent when meeting new people. He is extremely well trained and I have never had any problems with aggression towards people until today (he is also very good with other dogs but can be bossy at times). I was not home, but this is the situation as told to me by one of my two male roommates: One of my roommates was laying down with my dog, basically on top of him. My dog heard something that startled him and, while barking, tried to get up but my roommate prevented him from doing so. My dog then "pushed off my roommate with his mouth", (sorry, their words...) basically while barking and trying to get up it sounds like he bit my roommate in the face multiple times to the point where my roommate was bleeding. This does not sound at all like an accident from the way it was described to me. I am heartbroken over this situation and don't know where to go from here. Like I said before he has NEVER before shown any aggression towards people whatsoever. Any insight would be appreciated. Thank you.