There is a blood dragon that is following me around. He will not attack me unless I attack him. If I do attack he is just a generic blood dragon. I've only done two main and civil war quests. So it's not odhaviing the one you have follow you at the end of the game. At one point it was flying around and two wolves attacked me. It swooped down killed them with ice breath and flew away; there is no way it did not no I was there.