so..... I was being smart (sarcasm) and took my horse into the mines. I was amazed that I could do this. I've been playing a lot with my horse since I got him and thought he wouldn't enter it similarly to a house. But no he fit in. And understandably can't climb the ladder out. Help me xD 

When I go to leave I get the normal message to leave. However when I click yes I proceed to get off my high horse (snicker) not voluntarily and exit the mine. Then I have to enter and exit and enter and exit until I land on the right mineshaft that my horse is in. Scared me to death first time it happened. Even checked to see if he respawned back at the stables. Now I guess he has become a coal pony? I haven't checked to see if I even can, but does this mean I have to build a second stables and get the crap scared out of me once in a while when I go to restock on coal and copper because I forget he's down here? 

I know this can be fixed in a patch or something, I am just ticked at myself for trying because this may be a while before I get on horseback again and I just got him today lol.

just checked and it doesn't matter if I'm on level 1 or level 115, if I land on his mine layout he is there, waiting, looking at me with a judgemental face.......

oh gosh! I had an idea at 11:50pm to close my game before it saved. My horse is out of the mines xD but maybe it would be a good idea to make it so he can't enter because with my luck I'd end up getting him stuck there again hahahaha. 

Yeah I’m glad you thought to close the game before it saved. If you hadn’t you’d have been stuck until the next patch as the horses position gets reset to your stable after a patch. I don’t know why you could take your horse into the mines, it shouldn’t be possible, and as far as I know wasn’t possible last I checked. But I’ll look into it and fix it, shouldn’t be too hard.