I have a 3 yr old mustang gelding who has chronic diarrhea. We've had him since he was a yearling, and we've combated his diarrhea all along. Sometimes it's better, sometimes it's worse.
-- used several brands of pro and prebiotics, none of which seem to have had a significant effect
-- tried changing/altering his diet in several ways (the removal of all alfalfa helps)
-- tested for parasites (he's clear)
Aside from his diarrhea issues, he is a perfectly normal and healthy 3 yr old. He is a super easy keeper, and he has never shown any signs of colic.
Recently I have tried feeding him a psyllium supplement (although he is not in a sandy area so theoretically he shouldn't have sand in his gut). It's too early to tell for certain, but he seems to have improved over the last 2-3 days. This leaves me wondering whether it would be okay to feed him a consistent dose of psyllium to prevent his diarrhea.
Almost all of the psyllium products for horses advise giving them one week on and three weeks off of their psyllium dose. However, Metamucil is a psyllium product for humans which many people take every single day -- so I'm curious as to whether there is a reason that horses shouldn't be given a consistent daily dose of psyllium? I have also found an article which talks about psyllium having a positive effect for IR horses, which implies that there are benefits of feeding psyllium to horses every day: Psyllium for Glucose and Insulin Control | TheHorse.com
Provided that his diarrhea stays away, I am considering feeding him as follows:
-- grass hay provided via slow feeder
-- 1 lb soaked beet pulp (fed as a "base" to mix his supplements into)
-- vitamin/mineral supplement (Horse Guard)
-- pre/probiotic supplement (GutWerks by HorseTech)
-- 3-4 oz of psyllium (SandClear by Farnam)