I've used it to combat thrush before and it does pretty well for that (it's the acid). Also use it as a preventative measure when I clean feet if there's a situation that puts any of my horses in a weight, moddy area. Tea tree oil does a good job too (back an area with oil soaked cotton or gause. Tea tree oil is also great for things like scratches (rub it on the scratches). Not something I ever dealt with until I got horses with heavy feathering. And while I've never had anything but very small cases (you really had to feel for them) the tea tree oil knocked it right out in a couple of days.