Insects are more than annoying; they can also transmit serious diseases. You can't always be there to apply fly and insect protection, but Equi-Spot, Spot-On Protection for Horses does the job for you. Applied once every two weeks, it provides long-lasting control against dangerous ticks that can spread Lyme disease and mosquitoes that may transmit West Nile Virus and Equine Encephalitis, as well as biting flies and gnats. Protection lasts for up to 14 days. Ideal for pastured horses. Won't wash off in rain or when your horse sweats. | Farnam Equi-Spot-On Stable Pack