b658aed6__World_Interactions___UESPWiki__Details
[Encounter Name] Bandit Killed With Horse Left Behind [Options] The horse is free to ride. It travels when you fast travel, but won't stay in one place. [Requirements] None [Details] 
An idle horse, with a dead bandit usually by its feet or hidden in the undergrowth.
Skyrim:World Interactions - UESPWiki
Details