I'm a little surprised that biting flies are already lurking around. So far I'm just seeing one or two here and there, but it will get worse as it warms up. What do you guys use to protect your horses, goats, and other livestock from them? Last year I bathed them all in Dawn, vinegar, and water a few times after reading an article that suggested it. The residue left after rinsing them off was supposed to help, but it didn't seem to deter the flies much.