Ever wanted a tame fox, wolf, skeever, bear or netch as a follower? You've come to the right place. They are marked as essential so can't be accidently killed. They will fight to the death (or not because they can't die) to save you. Well apart from the fox and skeever, they'll run if out-matched. You can find them all in Eldergleam sanctuary.
Note: there's a small bug where if you talk to an animal, they'll instantly follow you. Just tell them to "go back to your cave" to fix this. If you can't talk to anything, it's probably because something else is following you. Sometimes you have to tell your pet to wait before you can select "follow me".