How to upgrade teammates and horses? Now my frost can't even beat the bear. I heard that the upper limit of frost is 25.

Download a MOD called UFO on 3DM, you can upgrade your followers, change his or her equipment, including undressing, recruit 15 companions at the same time, and let your companions ride horses. . .

As for the upgrade of the horse, it seems that it can't. But you can do a dark brotherhood task, and you will get a horse, handsome and violent.

One-on-one fight against the dragon is a cinch, and you can't die.