Check out the Carr & Day & Martin fly protection for horses at Houghton Country. With over 240 years experience Carr & Day & Martin have developed a wide range of fly repellents and soothing lotions for the treatment and prevention of sweet itch for more comfortable grazing even when the warm weather pests are at their worst. Carr & Day & Martin fly repellent sprays and gels come in various formulations including Citromax, Fly guard and Extra Strength so you can choose the right one for you and your horse.