Almost ANY horse can do a 25 miler. Try one
and see. Doing a 50 is something else again. There are some books
out on it so check some out. The first book I read used the classic
Appalousa for good confirmation for endurance. A big part is the will of
both horse and rider along with the conditions of the riding area. Do some
research and get reading on the subject and you will eventually make up your own
mind. Go to an endurance ride and watch and listen. It does still
take money in tack, equipment, gas and entry fees. Gas prices are not
helping. Good luck. Mary Ann