Yea, ACV. We have a 15 yr old mare that was getting bitten by flies and bleeding from them. We used ACV and Garlic in her food daily and could really see the difference in her bites. When we had gone on vacation the care givers ran out of ACV and when we returned we saw more bite marks on her again. The ACV and garlic both really work. It also keeps the flies down in the corral and barn.