We don't know the name of this thing.
But we do know where it came from. So we're using that to title the page logically. If you know a better, more precise name, tell us.
Taran horses were horses found on the planet Tara. Their relationship to Earth horses, if any, was unknown.
Count Grendel of Gracht carried Romana I to his horse after she had hurt her ankle. She had never seen such a creature before and asked "how it goes", but Grendel told her he was simply a knight not a farrier. He gave her a ride on the horse to Castle Gracht. (TV: The Androids of Tara)