Sacred Haven of Debauchery

In Skyrim, there are a lot of good, chubby horses. I installed a mod and can now summon them easily using a horn (or was the horn already in the original game? I don't know, I haven't seen it, although I might have just forgotten to buy it from the stable keeper). The mod also makes the horse immortal (because they died too easily without the mod) + it gives them a timid behavior (it would be strange if an immortal horse killed all the Draugr it encountered).