Have a technical question you can't find the answer to in FAQ's? Ask it here. Game problem questions that do NOT pertain to things like training advice, what would my horse do well in, how much is it worth.
you have to 'own' the horse, so either 'buy' it and 'sell' it back by bidding (could use a MM) or you have to put it on the market and they have to snag it that way.