10 Best Fly Repellents 2025 in the United States

The Country Vet FarmGard Permethrin Concentrate is a versatile and powerful insecticide designed for both indoor and outdoor use. It contains a 13.3% permethrin concentration, which is higher than many similar products, allowing it to deliver 33% more finished product and effectively control pests for up to 4 weeks with a single application. This makes it a cost-effective solution for those managing multiple animals or large areas.

Farnam Repel-X Ready-To-Use Fly Spray is a versatile insecticide and repellent designed mainly for horses and dogs, but also usable around barns and fabric items. Its active ingredient is permethrin, a common chemical effective against flies, mosquitoes, ticks, fleas, and other biting insects. This spray kills and repels multiple pests, which makes it practical for farm or stable use. The water-based formulation means it’s non-oily and ready to use without any mixing, making application easy with the included trigger sprayer or by wiping on. It has a pleasant scent, which is a nice bonus since some repellents can be strong or unpleasant-smelling. Safety-wise, it’s suitable for animals over one month old but should not be used on very young foals, and care must be taken to avoid eyes and sensitive areas. Since it contains permethrin, it’s important to follow directions closely because this chemical can be toxic to cats and some wildlife.

The Absorbine UltraShield EX 32oz Sprayer Insecticide is a robust fly-repellent suitable for use on horses, dogs, and premises. One of its main strengths is its ability to kill and repel over 70 species of pests, including flies, mosquitoes, ticks, and fleas. The formulation is water-based and ready-to-use, eliminating the need for mixing, which can be a real time-saver.