Hey 2 words.. please move! that is totally unsafe footing for a horse they could fall and break a leg or cast in a corner or get stuck and die trying to get out. it is not good to not have a pasture fo the horse if you do not have a pasture for he or she they will not get the nutrients they need... find a nice home were it is slitly hilly with lots of high grass and a riding area(unless your not into riding) there are plenty of grains that could get the horse back uptp the wat he or she is supposed to be at.. my horse latley had bin have some underwait problems but all i had to do was give her extra grain and now she looks like she is in a halter show class! so if that is land that is marshy and constantly wet it is NOT good for the horses either move or sell them because thats like you trying to live on wet cement barefoot it is not fun and its slippery... also build them a leanto... good luck!