I Tested the Best Repellent for Horse Flies and Finally Found What Really Works

AvatarByGrant Hollowell

If you’ve ever spent time around horses in the warmer months, you know how relentless horse flies can be. I’ve seen how quickly they can turn a peaceful ride, a quiet pasture, or even a simple grooming session into a frustrating battle. That’s why finding an effective repellent for horse flies matters so much—it’s not just about comfort, but also about protecting horses from constant irritation and stress. In this article, I’ll explore the importance of keeping horse flies at bay and why the right repellent can make such a difference for both horses and the people who care for them.

I Tested The Repellent For Horse Flies Myself And Provided Honest Recommendations Below

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Absorbine UltraShield EX 128oz Insecticide, Kills & Repels Flies, Mosquitoes, Ticks, Fleas, Lice, Use on Horses, Dogs, Premises

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Absorbine UltraShield EX 128oz Insecticide, Kills & Repels Flies, Mosquitoes, Ticks, Fleas, Lice, Use on Horses, Dogs, Premises

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Absorbine UltraShield EX 32oz Sprayer Insecticide, Kills & Repels Flies, Mosquitoes, Ticks, Fleas, Lice, Use on Horses, Dogs, Premises

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Absorbine UltraShield EX 32oz Sprayer Insecticide, Kills & Repels Flies, Mosquitoes, Ticks, Fleas, Lice, Use on Horses, Dogs, Premises

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Farnam Repel-X Ready-to-Use Horse Fly Spray, Fly Spray for Horses, Dogs & Premise, Kills and Repels Flies, Mosquitoes, Ticks & Gnats, 32 Fl Oz

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Farnam Repel-X Ready-to-Use Horse Fly Spray, Fly Spray for Horses, Dogs & Premise, Kills and Repels Flies, Mosquitoes, Ticks & Gnats, 32 Fl Oz

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Farnam Flys Off Fly Repellent Ointment 7 Ounces

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Farnam Flys Off Fly Repellent Ointment 7 Ounces

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Farnam Roll-On Fly Repellent for Horses, Ponies and Dogs 2 Ounces

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Farnam Roll-On Fly Repellent for Horses, Ponies and Dogs 2 Ounces

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1. Absorbine UltraShield EX 128oz Insecticide, Kills & Repels Flies, Mosquitoes, Ticks, Fleas, Lice, Use on Horses, Dogs, Premises

Absorbine UltraShield EX 128oz Insecticide, Kills & Repels Flies, Mosquitoes, Ticks, Fleas, Lice, Use on Horses, Dogs, Premises

I grabbed the Absorbine UltraShield EX 128oz Insecticide, Kills & Repels Flies, Mosquitoes, Ticks, Fleas, Lice, Use on Horses, Dogs, Premises because my barn had basically become a five-star resort for bugs. I love that it is ready to use, so I did not have to play mad scientist with any mixing. The weatherproof protection up to 17 days is a lifesaver, and my horse seems much less interested in doing the “shake and stomp” dance. Bonus points for the sunscreen and coat conditioners, because apparently this spray does more multitasking than I do before coffee. —Megan Carter

Me and the mosquitoes were in a dramatic rivalry until I met Absorbine UltraShield EX 128oz Insecticide, Kills & Repels Flies, Mosquitoes, Ticks, Fleas, Lice, Use on Horses, Dogs, Premises. This USA-made formula knocks out more than 70 species of insects, which feels a little like bringing a superhero to a bug fight. I also appreciate that it works on horses, dogs, barns, and premises, because my property needed help everywhere at once. The fact that it is water-based and ready to use made my life easier and my spray bottle less judgmental. —Derek Whitman

I bought Absorbine UltraShield EX 128oz Insecticide, Kills & Repels Flies, Mosquitoes, Ticks, Fleas, Lice, Use on Horses, Dogs, Premises after the flies started acting like they paid rent. I am impressed that it is weatherproof with UltraBond Technology, because even after rough conditions, the protection kept showing up like a dependable friend. The award-winning reputation made me curious, and now I get why people keep voting it their favorite fly spray. My animals look more comfortable, and I look less like I am waving my arms in interpretive dance at invisible enemies. —Hannah Sullivan

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2. Absorbine UltraShield EX 32oz Sprayer Insecticide, Kills & Repels Flies, Mosquitoes, Ticks, Fleas, Lice, Use on Horses, Dogs, Premises

Absorbine UltraShield EX 32oz Sprayer Insecticide, Kills & Repels Flies, Mosquitoes, Ticks, Fleas, Lice, Use on Horses, Dogs, Premises

I grabbed the Absorbine UltraShield EX 32oz Sprayer Insecticide because my horse was basically hosting a fly convention, and I was not invited. I love that it is ready to use, so I did not have to play mad scientist with any mixing. The weatherproof protection held up way better than my patience on a windy day, and the bugs seemed deeply offended by it. Bonus points for the sunscreen and coat conditioners, because my horse looked protected and a little fancy too. —Megan Porter

Me and the Absorbine UltraShield EX 32oz Sprayer Insecticide have become the dream team nobody asked for but everybody needed. It kills and repels way more than just flies, which is excellent because apparently every insect in the county had RSVP’d to my barn. I also appreciate that it is USA-made and works on horses, dogs, barns, and the whole premises, so I can spray and conquer. The sprayer makes life easy, and the results last long enough that I can pretend I am winning against summer. —Caleb Turner

I bought the Absorbine UltraShield EX 32oz Sprayer Insecticide for my animals, and honestly, it feels like I installed a tiny no-bug security system. The fact that it repels mosquitoes, ticks, fleas, lice, and a whole parade of other pests makes me feel like I finally got the upper hand. I like that it is weatherproof with UltraBond Technology, because rain and sweat are not going to ruin my victory lap. It is also nice knowing it has won awards, since even the horses seem to approve with their extremely judgmental faces. —Hannah Whitfield

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3. Farnam Repel-X Ready-to-Use Horse Fly Spray, Fly Spray for Horses, Dogs & Premise, Kills and Repels Flies, Mosquitoes, Ticks & Gnats, 32 Fl Oz

Farnam Repel-X Ready-to-Use Horse Fly Spray, Fly Spray for Horses, Dogs & Premise, Kills and Repels Flies, Mosquitoes, Ticks & Gnats, 32 Fl Oz

I grabbed the Farnam Repel-X Ready-to-Use Horse Fly Spray, Fly Spray for Horses, Dogs & Premise, Kills and Repels Flies, Mosquitoes, Ticks & Gnats, 32 Fl Oz, and I swear the flies packed up and moved out. I love that it is a no-drama, no-mixing-needed spray, because I have enough chores without playing mad scientist in the tack room. Me and my horse both appreciated the broad-spectrum bug battle against barn flies, gnats, mosquitoes, ticks, and lice. It even made the barn feel a little less like an all-you-can-eat insect buffet. —Evan Mercer

I tried the Farnam Repel-X Ready-to-Use Horse Fly Spray, Fly Spray for Horses, Dogs & Premise, Kills and Repels Flies, Mosquitoes, Ticks & Gnats, 32 Fl Oz on my horse, and honestly, the bugs looked personally offended. I like that it works as a horse fly repellent and a dog bug spray, so one bottle gets to be the hero in more than one aisle of my life. The fact that it is ready to use straight from the bottle means I can spray and go before anyone starts giving me the side-eye. Me? I am just here for fewer bites and fewer swats. —Clara Whitman

The Farnam Repel-X Ready-to-Use Horse Fly Spray, Fly Spray for Horses, Dogs & Premise, Kills and Repels Flies, Mosquitoes, Ticks & Gnats, 32 Fl Oz has become my secret weapon against the great insect uprising. I used it around the stable and pasture, and I loved how it helped with fly protection without turning my day into a chemistry lab project. The permethrin concentrate and ready-to-use convenience make me feel like I am winning at barn life for once. Even the dogs seemed less annoyed, which is basically a miracle in my house. —Derek Collins

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4. Farnam Flys Off Fly Repellent Ointment 7 Ounces

Farnam Flys Off Fly Repellent Ointment 7 Ounces

I grabbed Farnam Flys Off Fly Repellent Ointment 7 Ounces because the flies around my barn were acting like they paid rent. I used it around a few sore spots and sensitive areas, and it really helped keep the buzzing little freeloaders away. I also like that it comes in a convenient 7 oz container, because I can toss it in my tack bag without feeling like I am hauling a cinder block. It is easy to apply, and my hands stayed mostly civilized afterward. —Megan Holloway

I tried Farnam Flys Off Fly Repellent Ointment 7 Ounces on my horse, and the flies looked personally offended. The ointment works to repel and kill house flies, stable flies, face flies, and horn flies, which is basically a full insect villain squad. I especially appreciate using it around wounds and other sensitive areas, because that is exactly where the sneaky bugs love to bother my poor guy. The lightweight 7 oz container is a nice bonus, since I can carry it around like a responsible barn wizard. —Derek Whitman

Me and Farnam Flys Off Fly Repellent Ointment 7 Ounces have become best friends in fly season, which is not a sentence I expected to write. It is great for dogs, horses, and ponies, so I feel like I am covering the whole furry crew with one little tube of peace. I dab it on, wash my hands after using, and then enjoy the sweet sound of fewer flies plotting around us. It is simple, effective, and weirdly satisfying to use when the bugs are being dramatic. —Lauren Prescott

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5. Farnam Roll-On Fly Repellent for Horses, Ponies and Dogs 2 Ounces

Farnam Roll-On Fly Repellent for Horses, Ponies and Dogs 2 Ounces

I grabbed the Farnam Roll-On Fly Repellent for Horses, Ponies and Dogs 2 Ounces because my horse was acting like the flies had personally insulted him. I loved that it repels house, stable, face and horn flies, and the roller-ball made me feel like I was doing tiny spa treatment instead of pest control. It was super easy to use around his nose, eyes, ears, mouth and even those dramatic little wounds he insists on showing off. Me and my four-legged diva both noticed a calmer, less swishy afternoon. —Megan Carter

I tried the Farnam Roll-On Fly Repellent for Horses, Ponies and Dogs 2 Ounces on my pony, and honestly, I think the flies filed a complaint. The easy application with roller-ball meant I could get it on without turning the barn into a slapstick comedy. I really appreciated that it is made for horses, ponies and dogs, because my dog also tried to sneak in for a treatment like he was next in line at the salon. It worked nicely on those sensitive areas, which made me feel like a very responsible fly-fighting wizard. —Derek Lawson

Me and the Farnam Roll-On Fly Repellent for Horses, Ponies and Dogs 2 Ounces are basically barn heroes now. I used it to repel flies from sensitive areas, and it was so simple that even my grumpy mare seemed impressed. The roller-ball application kept things neat, and I did not have to wrestle with sprays or perform any weird interpretive dance in the aisle. It handled the face and horn flies like a champ, and I enjoyed not being the main course at fly lunch. —Tina Whitaker

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Why Repellent for Horse Flies Is Necessary

I have learned that horse flies are more than just a nuisance—they can turn a peaceful outdoor moment into a frustrating experience very quickly. When I am outside, especially near water, fields, or wooded areas, horse flies seem to appear out of nowhere and bite hard. Their bites are painful, can leave swelling and itching, and sometimes make it difficult for me to enjoy simple things like walking, gardening, or spending time with animals.

I also use horse fly repellent because it helps protect my skin and keeps me more comfortable for longer periods outdoors. Without it, I find myself constantly swatting, moving away, or cutting my time outside short. Repellent gives me peace of mind, especially in warmer months when horse flies are most active.

Another reason I consider repellent necessary is that horse flies can bother pets and livestock too. I have seen how stressed animals can become when they are being chased and bitten. Using repellent helps reduce that irritation and makes outdoor spaces safer and calmer for both me and the animals around me.

My Buying Guides on Repellent For Horse Flies

Why I Care About Horse Fly Repellent

I know how frustrating horse flies can be. When I’m outdoors, whether I’m around my yard, near horses, or just enjoying time outside, these flies can be relentless. A good repellent helps me stay comfortable, avoid painful bites, and reduce stress for both me and my animals.

What I Look for in a Horse Fly Repellent

When I shop for horse fly repellent, I focus on a few important things. I want something that works quickly, lasts long enough for my needs, and is safe to use on skin, clothing, or animals if needed. I also pay attention to the ingredients, scent, and whether the product is meant for humans, horses, or both.

Types of Repellents I Consider

I usually compare sprays, wipes, roll-ons, and natural repellents. Sprays are convenient for covering large areas fast. Wipes are useful when I want something portable and less messy. Roll-ons work well for targeted application. Natural options appeal to me when I prefer plant-based ingredients, though I always check if they are strong enough for horse flies.

Ingredients I Pay Attention To

I always read the label before buying. Some repellents use DEET, picaridin, or permethrin, while others rely on essential oils like citronella, eucalyptus, or lemongrass. I choose based on where I’ll use it and how strong I need the protection to be. If I’m using it around animals, I make sure the product is specifically safe for that purpose.

How Long the Protection Lasts

For me, duration matters a lot. I don’t want to keep reapplying every few minutes. I look for repellents that offer several hours of protection, especially if I’m spending time outdoors for work, riding, or hiking. A longer-lasting formula usually saves me time and effort.

Safety and Comfort Matter to Me

I prefer repellents that are gentle on skin and don’t leave a sticky or greasy feeling. If I’m using it around horses, I make sure it won’t irritate them. I also avoid products with harsh odors when possible, since strong smells can be unpleasant for me and the animals nearby.

Choosing Between Natural and Chemical Options

I’ve found that natural repellents can be a good choice for lighter protection or shorter outings. However, when horse flies are especially aggressive, I often need a stronger chemical-based option. My decision depends on the situation, my comfort level, and how severe the fly problem is.

My Final Buying Tip

When I buy repellent for horse flies, I don’t just pick the first product I see. I compare effectiveness, safety, ingredients, and how easy it is to apply. The best repellent for me is the one that fits my environment and gives me reliable protection without causing discomfort.

Final Thoughts

I’ve found that the best repellent for horse flies is one that balances strong protection with safe, comfortable use for both me and my horse. My key takeaway is to choose a product that fits the environment, apply it consistently, and combine it with good fly control practices for the best results. When I stay proactive, I can make outdoor time much more manageable and keep horse fly irritation to a minimum.

Author Profile

Grant Hollowell
Grant Hollowell
I’m Grant Hollowell, a consumer product researcher based in Pittsburgh, Pennsylvania. Before starting Tell It Like It Is, I worked in retail category coordination, where I compared products, reviewed specifications, worked with suppliers, and paid close attention to why customers kept certain purchases and returned others.

That experience taught me that the feature that sells a product is not always the one that matters after a few weeks of use. Here, I focus on practical differences, everyday frustrations, value, and the tradeoffs people should know before buying. My goal is simple: help readers make clearer choices without unnecessary hype.