Last year the horse flys were just awful. I tried all sorts of home remedys because I felt I was overdoing it with the pesticides.
I acually mixed up a concoction of ac vinagar, garlic, a leave in human conditioner and a bounce drier sheet in a bowl strained it, cut it with water and sprayed it on my horse. She smelled pretty funky but it did work.
I also mix a gloppy mess of bees wax and pine tar, melt it on the stove and put it on their hooves with a paint brush when its been really wet.
I use ac vinagar for a lot of things even on myself.
"Until one has loved an animal, part of one's soul remains unawakened..."
- Anatole France