From what little I know about horses, almost all your time is spent trying to make sure they don't kill themselves. I can leave my vechile outside in the cold for weeks at a time and not have to think about it.
That makes horses relatable. I can't relate to being a non-sentient bundle of metal and glass and stuff, but I can relate to freezing to death and killing myself.
I mean it's not because they want to die. We're just talking about an animal that can die if it gets indigestion(the most common cause of death in domestic horses is colic). Some biological engineering points when it comes to horses are frankly quite bizarre when you compare them to ruminants.