Please don't worry about calling a vet. It is perfectly normal for horses to do this. Watch them In the pasture, when they have to go, they stop. You have to teach them to continue moving while defecating. Basically, when he tries to stop, kick, cluck, kiss, pop him with the reins, anything to keep him moving. It will take a while to retrain him now but it can be done. On a side note, that is how trackers could tell if the horse they were tracking was ridden or not. Poop in a pile? Not ridden. Poop in a traveling line? Horse ridden.
i i am not answer you qestion i am just wanting to know if you read the canterwood crest books they are horse books. just look for me then tell me in any of my qestions and do u go on goodreads. please answer me back