10 Best Horse Fly Sprays 2026 in the United States

The Absorbine UltraShield EX Combo is a strong choice if you need a versatile insect spray that not only kills but also repels a wide range of bugs, including flies, mosquitoes, ticks, and more. Its active ingredients—pyrethrins, piperonyl butoxide, and permethrin—are known for effective pest control. A big plus is its long-lasting protection of up to 17 days, thanks to its weatherproof UltraBond Technology, which means it holds up well even in tough outdoor conditions. The spray is ready to use with no mixing required, making application simple whether you’re spraying horses, dogs, barns, or outdoor areas. The citronella scent is a natural choice that many users find pleasant, and it includes added sunscreens and coat conditioners, which is great for protecting your animal's skin and coat while fighting insects.

Because it contains permethrin, it should be used carefully and only on animals older than 12 weeks, as it can be sensitive for younger or certain pets. Also, while water-resistant, heavy rain might reduce its effectiveness before the full 17 days. This product is especially suited for horse owners looking for a reliable, easy-to-apply spray that works against many insect types and lasts well in outdoor environments. For those seeking something gentle for sensitive areas, consulting a vet is recommended, but for broad insect control combined with skin protection, this spray is a solid pick.

The Absorbine UltraShield EX 128oz Insecticide is a potent option for those needing a robust solution to repel and kill a wide array of pests. It boasts a strong formula that can tackle over 70 types of insects, including flies, mosquitoes, ticks, and fleas, making it versatile for use on horses, dogs, and even around barns and premises. The product's UltraBond Technology ensures it remains effective for up to 17 days, which is notably long-lasting compared to many other products on the market.

It's ready to use right out of the bottle, requiring no mixing, which simplifies the application process. Additionally, the water-based formula is a plus for those looking for easy cleanup and less sticky residue. Its weatherproof properties mean it will remain effective even in less-than-ideal conditions. The inclusion of sunscreens and coat conditioners is a thoughtful touch, providing additional care for your animals' coats while protecting them from bugs and UV rays.

However, potential users should be aware that, while the product is powerful, it might not be the best option for very sensitive areas or animals with particularly sensitive skin. For those looking for a comprehensive and long-lasting insecticide, Absorbine UltraShield EX offers a wealth of benefits. It is particularly well-suited for horse owners who need a reliable, weatherproof solution with added coat care benefits.

Farnam Endure Fly Spray is designed to protect horses from a wide range of biting insects including flies, mosquitoes, ticks, and gnats. Its active ingredient, permethrin, is known for effective insect control. The spray offers a long-lasting effect—up to 14 days—so frequent reapplication is not necessary. This is especially useful if your horse spends a lot of time outdoors in hot, humid, or sweaty conditions, as the product is sweat-resistant and maintains protection even in rain or during heavy work.

You can apply Farnam Endure either by spraying or wiping it on, which makes it flexible for reaching sensitive areas like the face and legs safely, a plus for horses with delicate skin. It is also pleasantly scented, which can be more comfortable for both horse and handler. The large 128-ounce refill size is convenient for regular use or for multiple horses.

As with many insect repellents containing permethrin, it should be used according to instructions to avoid irritation, especially on very sensitive horses or open wounds. While highly effective, some users might find that in extremely wet conditions reapplication may still be necessary despite its water resistance. Farnam Endure provides reliable, long-lasting fly protection ideal for performance horses, pasture animals, or any horse owner seeking a durable, sweat-proof insect spray.