My friend has a horse that has itchy skin. It's been variously diagnosed as fly-bite sensitivity, and other things which have slipped my mind at the moment. The latest vet suggested feeding the horse half a cup of yogurt daily to change the intestinal flora that might be causing him to itch. One half a cup of yogurt seems like it would make little difference to a horse whose large body is basically intestines. The horse does scratch his hind end but it's likely not his butt that's itching, but his tail. His mane, tail, and mid-line tend to be his itchy places. Have any of you horse owners or vets had any experience with this sort of situation? Horse is fed timothy hay, and lately a small amount of rolled oats, besides mineral supplements. Horse has been in several different environments over the years. He is now 6 or maybe 7 years old and the itching has been a recurring problem.