I have had Doberman's my whole life and I have to agree with most everything that has been said so far. They are very easily trained (both house trained and sit, stay etc), and they are very protective of their people. However, they LOVE their people and want to be around them all the time. All of my Dobies have been house dogs. But, like I said they are protective, but I wouldn't say they are aggressive. For instance, if you bring a friend over to your house and introduce him to your dog, then the dog isn't going to attack him. I got mine from a breeder but I completely support a rescue group. Hope this helped a little!