Flynn had hindgut issues for about 18 months. Diarrhea started soon after his trailer was rear-ended at 70 km / hr, a horrible ordeal for any horse. Healing from injuries took months. Learning how to trust a trailer again took months. Cow-patty diarrhea never resolved. His mane and tail thinned drastically after a year of having no solid poops. Blood tests, fecal tests and trace mineral panels run and re-run. Every abnormal value was treated without any resolution. Balanced and re-balanced his diet, ruling out each part of his diet as a possible cause. Treated him for hindgut ulcers for an entire month with Sucralate, no change. Started probiotics after over a year of frustrated attempts to achieve a solid poop, and watching my horses' health slowly decline. First two made no change a...