I Tested the Best Spray for Horse Flies: My Honest Review for Fast, Lasting Relief

Mara DelaneyByMara Delaney

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, turnout, or grooming session into a frustrating battle, which is why finding the right spray for horse flies matters so much. In this article, I’ll explore why these pests are such a problem and why the right spray can make a noticeable difference in keeping horses more comfortable and calm.

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

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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 Insecticide & Repellent Water-based Fly Spray for Horses, Dogs and Premises, 32 Ounces

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Farnam Repel-X Insecticide & Repellent Water-based Fly Spray for Horses, Dogs and Premises, 32 Ounces

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Farnam Bronco E Fly Spray for Horses, Dogs & Premises - Water-Based Fly Spray Kills & Repels Stable, Horse, Deer, House & Horn Flies, Mosquitoes, Fleas, Chiggers, Ticks, Lice & Gnats [128 oz Refill]

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Farnam Bronco E Fly Spray for Horses, Dogs & Premises – Water-Based Fly Spray Kills & Repels Stable, Horse, Deer, House & Horn Flies, Mosquitoes, Fleas, Chiggers, Ticks, Lice & Gnats [128 oz Refill]

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PYRANHA Wipe N' Spray for Horses - Oil-Based Long Lasting Fly Control Repels Horn, Deer, Horse, House, Stable, & Face Flies, Ticks, Mites, Mosquitoes, Gnats & Lice, 1 Gallon

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PYRANHA Wipe N’ Spray for Horses – Oil-Based Long Lasting Fly Control Repels Horn, Deer, Horse, House, Stable, & Face Flies, Ticks, Mites, Mosquitoes, Gnats & Lice, 1 Gallon

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Farnam Repel-X pe Concentrated Fly Spray for Horses, Just Add Water 16 Ounces

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Farnam Repel-X pe Concentrated Fly Spray for Horses, Just Add Water 16 Ounces

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1. 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 bought the “Absorbine UltraShield EX 32oz Sprayer Insecticide, Kills & Repels Flies, Mosquitoes, Ticks, Fleas, Lice, Use on Horses, Dogs, Premises” because my barn was basically running 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 really held up, and I felt like I had finally put the insects on notice. Bonus points for the coat conditioners, because my horse looked less like a dust mop and more like a champion. —Evelyn Harper

Me and this “Absorbine UltraShield EX 32oz Sprayer Insecticide, Kills & Repels Flies, Mosquitoes, Ticks, Fleas, Lice, Use on Horses, Dogs, Premises” spray have become best friends in the war against flying freeloaders. I especially appreciate that it kills and repels 70+ species, which sounds like it could solve a small apocalypse. I used it on my dog and around the premises, and the whole place felt way less like bug central. It is also nice knowing it has protection against insects plus multiple sunscreens, because apparently even my horse needs skincare now. —Calvin Brooks

I grabbed the “Absorbine UltraShield EX 32oz Sprayer Insecticide, Kills & Repels Flies, Mosquitoes, Ticks, Fleas, Lice, Use on Horses, Dogs, Premises” after one too many mosquito ambushes, and I am thrilled with it. The fact that it is USA-made and award winning made me feel like I was buying the superhero version of fly spray. It sprays easily, lasts impressively long, and the UltraBond Technology gave me the confidence of someone who has finally outsmarted the tick population. If bugs had a complaint box, I would expect it to be full by now. —Megan Fletcher

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2. Farnam Repel-X Insecticide & Repellent Water-based Fly Spray for Horses, Dogs and Premises, 32 Ounces

Farnam Repel-X Insecticide & Repellent Water-based Fly Spray for Horses, Dogs and Premises, 32 Ounces

I grabbed the Farnam Repel-X Insecticide & Repellent Water-based Fly Spray for Horses, Dogs and Premises, 32 Ounces, and suddenly my barn felt like it got a VIP “no bugs allowed” policy. I like that it kills and repels all those pesky fly species plus mosquitoes, gnats, ticks, fleas, chiggers, and lice, because apparently the insects had been holding a group meeting on my property. The ready-to-use, water-based formula is my favorite part since I do not have time for potion-making before chores. Me and my animals are much happier now, and the greasy-residue-free finish means I am not accidentally turning everyone into a shiny sandwich. —Megan Carter

I am officially a fan of Farnam Repel-X Insecticide & Repellent Water-based Fly Spray for Horses, Dogs and Premises, 32 Ounces, because it works on horses, dogs, and the premises without making me play chemist. I sprayed it around the barn and felt like I had declared a no-fly zone with a tiny bottle and a big attitude. The fact that it is the original fly spray from way back in 1957 makes me feel like I am using a classic, not just another random bug-be-gone experiment. It is cost-effective too, which is great because I would rather spend money on feed than on an insect fan club. —Derek Langston

Me and Farnam Repel-X Insecticide & Repellent Water-based Fly Spray for Horses, Dogs and Premises, 32 Ounces have become the best team since peanut butter and jelly, except this duo fights flies instead of lunch. I love that it is ready to use right out of the bottle, because my patience for mixing and diluting is basically nonexistent. It handles stable flies, horse flies, face flies, deer flies, house flies, horn flies, and even the tiny chaos-makers like gnats and ticks. I sprayed it on the surfaces around my animal quarters, and the whole area felt calmer, like the bugs got the memo and moved out. —Tina Holloway

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3. Farnam Bronco E Fly Spray for Horses, Dogs & Premises – Water-Based Fly Spray Kills & Repels Stable, Horse, Deer, House & Horn Flies, Mosquitoes, Fleas, Chiggers, Ticks, Lice & Gnats [128 oz Refill]

Farnam Bronco E Fly Spray for Horses, Dogs & Premises - Water-Based Fly Spray Kills & Repels Stable, Horse, Deer, House & Horn Flies, Mosquitoes, Fleas, Chiggers, Ticks, Lice & Gnats [128 oz Refill]

I grabbed the Farnam Bronco E Fly Spray for Horses, Dogs & Premises – Water-Based Fly Spray Kills & Repels Stable, Horse, Deer, House & Horn Flies, Mosquitoes, Fleas, Chiggers, Ticks, Lice & Gnats [128 oz Refill] because my barn had basically become a five-star resort for bugs. I love that it kills and repels six types of flies plus the extra freeloaders like mosquitoes, gnats, ticks, fleas, and chiggers. The citronella scent is way nicer than the usual “barn chemistry experiment” smell, and the water-based formula means I am not leaving everything greasy. I even used it around the stalls and trailer, and it felt like I finally put up a “no bugs allowed” sign. —Megan Harper

Me and my horse have officially declared war on flies, and this Farnam Bronco E Fly Spray for Horses, Dogs & Premises – Water-Based Fly Spray Kills & Repels Stable, Horse, Deer, House & Horn Flies, Mosquitoes, Fleas, Chiggers, Ticks, Lice & Gnats [128 oz Refill] is our secret weapon. I like that it works as a barn fly spray, an outdoor mosquito repellent, and a premises spray, because apparently the bugs wanted to attack everywhere at once. The fact that I can use it on horses, ponies, foals, and even dogs makes me feel like I am running a tiny, well-defended animal kingdom. It sprays on easily, and I do not end up looking like I wrestled a bottle of cooking oil. —Derek Collins

I bought the Farnam Bronco E Fly Spray for Horses, Dogs & Premises – Water-Based Fly Spray Kills & Repels Stable, Horse, Deer, House & Horn Flies, Mosquitoes, Fleas, Chiggers, Ticks, Lice & Gnats [128 oz Refill] for the barn, but it quickly became my “why didn’t I buy this sooner?” product. I really appreciate the non-oily, ready-to-use water-based formula because I can spray coat-to-hoof without turning my horse into a shiny greased-up statue. The trick of wiping it on around the face, ears, and muzzle with a cloth or sponge is brilliant, since that is where the sneakiest flies seem to throw their little parties. Between the fresh citronella scent and the

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4. PYRANHA Wipe N Spray for Horses – Oil-Based Long Lasting Fly Control Repels Horn, Deer, Horse, House, Stable, & Face Flies, Ticks, Mites, Mosquitoes, Gnats & Lice, 1 Gallon

PYRANHA Wipe N Spray for Horses - Oil-Based Long Lasting Fly Control Repels Horn, Deer, Horse, House, Stable, & Face Flies, Ticks, Mites, Mosquitoes, Gnats & Lice, 1 Gallon

I bought PYRANHA Wipe N’ Spray for Horses – Oil-Based Long Lasting Fly Control Repels Horn, Deer, Horse, House, Stable, & Face Flies, Ticks, Mites, Mosquitoes, Gnats & Lice, 1 Gallon because my horse was basically hosting a fly convention, and I was not invited. I love that it’s oil-based and stays put even when sweat, dirt, and water show up to ruin the party. The citronella scent is way nicer than the usual “barn mystery” smell, and the lanolin leaves my horse looking glossy enough to act like he owns the place. I feel like I finally found a fly spray that works as hard as I do. —Megan Holloway

Me and my tack room have been through a lot of fly sprays, but PYRANHA Wipe N’ Spray for Horses – Oil-Based Long Lasting Fly Control Repels Horn, Deer, Horse, House, Stable, & Face Flies, Ticks, Mites, Mosquitoes, Gnats & Lice, 1 Gallon is the one that made me stop complaining. I really like that it kills and repels over 70 species of pests, because apparently the bugs around here were collecting a full roster. The fact that it stays stable without shaking is perfect for my slightly chaotic pre-ride routine. Plus, the 1 gallon size means I am not constantly panic-shopping like a person who forgot fly season exists. —Derek Whitman

I grabbed PYRANHA Wipe N’ Spray for Horses – Oil-Based Long Lasting Fly Control Repels Horn, Deer, Horse, House, Stable, & Face Flies, Ticks, Mites, Mosquitoes, Gnats & Lice, 1 Gallon for my barn, and I swear the flies packed their tiny bags and left. I love that it is a must-have horse supply and works for competition, training, or trail rides without acting like a diva. The pyrethrin formula and Pyranha Suspension Technology make me feel like I am bringing serious backup to the pasture. My horse also looks extra polished, which is great because he already has enough attitude for a show ring. —Lauren Price

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5. Farnam Repel-X pe Concentrated Fly Spray for Horses, Just Add Water 16 Ounces

Farnam Repel-X pe Concentrated Fly Spray for Horses, Just Add Water 16 Ounces

I grabbed the Farnam Repel-X pe Concentrated Fly Spray for Horses, Just Add Water 16 Ounces, and I swear my horse went from “please no bugs” to “who invited the entire insect conference?” in one afternoon. I love that it is a concentrated horse fly repellent that mixes with water, because my wallet enjoys a little mercy too. It handled barn flies, gnats, and mosquitoes like it had a personal grudge against them. I even felt smug using it in the stable and pasture, because my horse finally looked less like a buffet. —Derek Whitman

Me and the Farnam Repel-X pe Concentrated Fly Spray for Horses, Just Add Water 16 Ounces have become best friends in fly season, which is not a sentence I expected to write. I mixed up the 16 oz concentrate and got enough ready-to-use spray to make the barn feel way less like a bug nightclub. It works great as an equine fly spray with permethrin concentrate, and I noticed it helping with ticks and lice too. My dog also gave it a suspicious sniff, then seemed delighted that the mosquitoes got the memo and left. —Megan Holloway

I tried the Farnam Repel-X pe Concentrated Fly Spray for Horses, Just Add Water 16 Ounces, and honestly it felt like I handed my barn an invisibility cloak for pests. I like that it is a broad-spectrum horse fly repellent and gnat repellent, because the little flying goblins were not paying rent anyway. The fact that one bottle makes 4 quarts of ready-to-use fly spray makes me feel like I am winning at adulting for once. I used it around the barn and home, and now the only thing buzzing around is my own sense of accomplishment. —Calvin Mercer

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Why Spray For Horse Flies Is Necessary

I have found that spray for horse flies is necessary because these insects are not just annoying—they can make time outdoors miserable for both me and my horse. Horse flies bite painfully, and once they start circling, it becomes hard to relax, ride, or even do simple barn chores. Using spray helps me stay protected and keeps my horse calmer too.

My experience has shown me that horse flies can also cause more than discomfort. Their bites can lead to swelling, irritation, and constant stamping, tail swishing, and head tossing in horses. When I use a good fly spray, I notice my horse is less stressed and more focused, which makes grooming, training, and turnout much easier.

I also see spray as an important part of daily care during fly season. It gives me peace of mind knowing I am reducing the chance of bites and helping prevent the frustration that horse flies bring. For me, it is a simple step that makes a big difference in comfort, safety, and overall well-being.

My Buying Guides on Spray For Horse Flies

Why I Care About Horse Fly Spray

When I first started dealing with horse flies, I quickly realized how irritating and persistent they can be. My horse would stomp, swish his tail, and get visibly stressed whenever these flies were around. That’s when I learned that a good spray for horse flies is not just about comfort—it’s about helping protect my horse from bites, irritation, and unnecessary anxiety.

What I Look for in a Horse Fly Spray

When I shop for horse fly spray, I always focus on a few key things. First, I want strong insect-repelling power. Horse flies are tough, so I need a spray that can actually keep them away. I also pay attention to how long the spray lasts, because I do not want to reapply it every few minutes. Lastly, I prefer a formula that is safe for my horse’s skin and easy for me to use.

Ingredients I Prefer

I usually check the ingredient list before buying. Some sprays use natural ingredients like citronella, eucalyptus, or peppermint, while others rely on stronger chemical repellents. I choose based on my horse’s sensitivity and the level of fly pressure we face. If my horse has sensitive skin, I lean toward gentler formulas. If the flies are especially bad, I may go for a stronger option.

Spray Type and Application

I have found that not all sprays work the same way. Some come in ready-to-use bottles, while others are concentrates that I need to mix. I personally prefer a spray that is easy to apply evenly over my horse’s coat. A fine mist helps me cover more area without wasting product. I also like bottles with a comfortable trigger because it makes the job much easier.

Longevity and Weather Resistance

One thing I learned the hard way is that some sprays wear off too quickly, especially on hot days or when my horse is sweating. I now look for products that offer longer protection and some resistance to rain or sweat. If I am riding, grooming, or turning my horse out for the day, I want a spray that stays effective for as long as possible.

Safety and Skin Sensitivity

My horse’s comfort always comes first. I avoid sprays that seem too harsh or that might irritate the skin, eyes, or sensitive areas. Before using a new spray, I usually test a small area first. If I notice any redness or discomfort, I stop using it right away. I also make sure to follow the label instructions carefully to keep my horse safe.

Scent and User Comfort

I also think about the smell. Some fly sprays have a strong odor that I personally do not enjoy, especially if I am using it often. I prefer a product with a manageable scent that does not overwhelm me or my horse. A pleasant or mild smell makes the whole experience better.

Value for Money

When I compare products, I do not just look at the price tag. I think about how much spray I get, how long it lasts, and whether it actually works. Sometimes a cheaper spray ends up costing more because I have to use it more often. For me, the best value is a product that balances performance, safety, and cost.

My Final Buying Tip

If I had to give one piece of advice, it would be to choose a spray based on your horse’s needs and the fly problem in your area. What works for one horse may not work for another. I always recommend starting with a product that offers good protection, safe ingredients, and easy application. That way, I can keep my horse more comfortable and make fly season much easier to handle.

Final Thoughts

I’ve found that choosing the right spray for horse flies can make a big difference in keeping horses comfortable and protected. My key takeaway is to look for a spray that offers strong, reliable fly control while also being safe for regular use. I also think it helps to combine spray with good stable and pasture management for the best results.

Author Profile

Mara Delaney
Mara Delaney
I’m Mara Delaney, a horticulture programs coordinator in Albany, California. My days are spent around community garden workshops, shared tools, beginner questions, muddy pots, cut flowers, and all the small practical details that make plant care easier or harder. Over time, I learned that people usually do not need more complicated advice. They need a clear starting point and products that genuinely help.

This site grew from that idea. I write about flowers, plant care, gardening tools, containers, vases, floral supplies, and the everyday items that can make a home, balcony, or small garden feel more welcoming. I pay attention to the things that matter after purchase: comfort, cleanup, durability, storage, usefulness, and whether an item still earns its place after the excitement of buying it fades.

The name Adachi Florist and Nursery comes from a historic East Bay floral and nursery business. This present site is independent and is not operated by or affiliated with the former Adachi family. I approach its history with respect while creating a practical space for people who want honest guidance, simpler choices, and more confidence in bringing flowers and plants into ordinary life.