Bio-Groom Repel-35 Insect Control Horse Spray, 1-gal, 1-gal, bundle of 2; Bio-Groom Repel-35 Insect Control Horse Spray offers long-lasting protection against some of the most common insects that bug your horse. This spray helps to repel horn flies, face flies, horse flies, mosquitoes and gnats, so these pesky bugs buzz off. Additionally, the spray helps to kill ticks, fleas and lice and louse eggs for a happier, healthier horse. The formula features permethrin for long-lasting effects. Its non-irritating water base formula includes both lanolin and aloe vera, making this spray ideal for sensitive-skinned equines.