A friend's wife decided she wanted a few of those miniature horses. They grew a few inches too tall to show but they kept them as pets. Never shod, fortunately, because they had the run of the house and still beat the heck out of it. In the summer the doors were always wide open and the horses were everywhere - upstairs, downstairs, sleeping on the couch. Ornery little buggers too. They took great pleasure in sneaking up behind you and nipping you on the butt.
IMO, not all animals should be allowed in our homes but to each his own. Were these cute little critters housebroken?