Vampires and cat's don't like me

When I started playing today I fast traveled to the last place I explored the horse that often appears when I fast travel was there (some bug). So I got on the horse and started riding to the next unexplored location, but along the way I got ambushed by some saber-tooth cats. I get off the hose and use my fire spell on it, but it's so close to the hose that both get hit. Now the horse is aggressive to me and tries to attack, this triggers my companion to see the hose as hostile and attack it. I use the "calm animal" yell to calm both the cat and horse, but my companion is still trying to kill the horse! I get on the hose and that stops the companion, but I can't fast travel because the horse is seen as an enemy and I can't get off the horse or else the companion would just start killing it again.

So I had to go back to my last save before that mess all happened.

The unexplored location turned out to be a den where a vampire and his 2 servants "lived", good thing that they are weak to fire! As far as I could tell I wasn't infected by the vampire, but it's really hard to tell when you get a disease in this game (unless I'm missing something).

Next I found an old tomb filled with traps, and the ghost of a bard gradually bringing me through it. In the end I found the bard's remains and read his last song, and then he opended up the final chamber where he helped me battle a hoard of undead knights and a dead king. Not only did I get a lot of good loot (but no lute), but I learned a new shout that zooms me forwards about 100 feet in a second.