So it was getting dark in my game, so I tried riding my horse (which has a saddle) into a average villager house,onviosuly it didn't fit so I made a 3 by 2 hole for it to go through then turned around and filled it in, this was when the horse visuals had disappeared but there were no indications of it dying 

so I slept, then when it was day, I destroyed a few blocks of the house to see if it had got stuck in the wall.Then I logged off to see if it was just a glitch, but still nothing.I destroyed the blocks 3 down in the ground, then the rest of the house, still nothing.I logged off/on a few more times and walked 100 blocks and back and still, it wasn't there. 
I don't really know what to do, so hopefully someone can help

 (Also I have no clue what av is so I just picked a random one)

Thank you!