Horse Master Dennet issue...
I completed his wifes quest to clear out the wolves then went on to the watchtowers. After marking the last watch tower location, the quest just dissapeared. I went back to Dennet and he acted like I hadn't completed the watch tower quest. I went to Bran or whatever his name is to see if I just had to talk to him and he gave me the quest again, despite the fact I completed it, however THIS TIME I cannot mark the tower locations because they're already marked. Basically I am unable to recruit Dennet bc I guess I saved shortly after marking the last location and my other save was in the frostbacks... I'm not starting all the way over because of this. Will I be unable to store horses/mounts now bc I cannot get Dennet?
It was a long time since I played this part, but I believe it is not a glitch. You have to go to your war room and order your men to build the watchtowers from here. After that you should be able to recruit Dennet. Correct me if I'm wrong, it was a long time ago.