Can Horses Tell Color? Different Food?
(Cincinnati, OH, U.S.A)
Put out different colored objects and see which colored object is most picked by the horse. Leave the horse on a loose rein so you have as little as possible to do with it.
Also you could do a test of which food horses like. And better yet mix the two together put the same food in different colored buckets and see which bucket is picked by the most horses with little to no human involvement.