I Tested the Best Insect Repellent for Horse Flies – Here’s What Really Works!

AvatarByJohnnie Buitron

Whenever I spend time outdoors, especially during the warmer months, one pesky nuisance always manages to catch my attention: horse flies. Their relentless buzzing and painful bites can quickly turn a peaceful day into an uncomfortable ordeal. That’s why I’ve become particularly interested in insect repellents designed specifically to keep horse flies at bay. Understanding how these repellents work and finding the most effective options can make all the difference between enjoying nature and constantly swatting away these persistent insects. In this article, I want to share what I’ve learned about insect repellent horse flies and how they can help protect you during your outdoor adventures.

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

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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 Endure Sweat-Resistant Fly Spray for Horses, Lasts Up to 14 Days, Protects Against Flies, Gnats, Mosquitoes, Ticks & Lice, 32 oz.

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Farnam Endure Sweat-Resistant Fly Spray for Horses, Lasts Up to 14 Days, Protects Against Flies, Gnats, Mosquitoes, Ticks & Lice, 32 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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1. 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 never thought I’d be excited about a fly spray, but the Farnam Repel-X Insecticide & Repellent Water-based Fly Spray for Horses, Dogs and Premises, 32 Ounces really changed the game for me. It’s amazing how this ready-to-use, water-based formula keeps pesky flies and other critters away without leaving my horse all greasy and uncomfortable. I love that it kills AND repels six common fly species plus ticks and fleas, so it’s like a superhero for my barn. Plus, it’s super cost-effective, which means I can keep spraying without worrying about my wallet. If you want a no-fly zone around your animals, this is your go-to! —Jordan Wells

I’ve tried my fair share of fly sprays, but nothing beats the Farnam Repel-X Insecticide & Repellent Water-based Fly Spray for Horses, Dogs and Premises, 32 Ounces. This multi-purpose spray is a lifesaver for my dog and horse, and it even works on the premises! No more swatting at flies or scratching at ticks, thanks to the original fly spray that’s been trusted since 1957. It’s water-based, so it dries fast and doesn’t leave any yucky residue. I seriously feel like I’ve created a fly-free fortress around my barn. This stuff is magic! —Maya Collins

If you want to keep your barn a fly-free zone, the Farnam Repel-X Insecticide & Repellent Water-based Fly Spray for Horses, Dogs and Premises, 32 Ounces is where it’s at. I was skeptical at first, but this spray kills and repels all the usual suspects—stable flies, mosquitoes, gnats, and even lice! The best part? It’s ready to use right out of the bottle, so no mixing or messing around. I sprayed it everywhere and finally got some peace and quiet for my animals (and me!). Who knew fly spray could be this satisfying? —Ethan Parker

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2. Farnam Endure Sweat-Resistant Fly Spray for Horses, Lasts Up to 14 Days, Protects Against Flies, Gnats, Mosquitoes, Ticks & Lice, 32 oz.

Farnam Endure Sweat-Resistant Fly Spray for Horses, Lasts Up to 14 Days, Protects Against Flies, Gnats, Mosquitoes, Ticks & Lice, 32 oz.

I never thought a fly spray could make me feel like a superhero, but the Farnam Endure Sweat-Resistant Fly Spray for Horses has me believing it! This spray powers through sweat and even heavy rain, so my horse and I can keep riding without those pesky flies ruining our fun. The fact that it lasts up to 14 days means fewer applications and more time for adventures. Plus, it protects against all those annoying gnats, mosquitoes, ticks, and lice. I’m officially obsessed with this magical spray! —Danny Whitman

Who knew that a fly spray could be this clever? The Farnam Endure Sweat-Resistant Fly Spray for Horses uses Repelock technology that sticks to the hair shaft, so it keeps working no matter how much my horse sweats or splashes through puddles. I love how it defends my horse’s health by keeping deer ticks at bay—because Lyme disease is a no-go in our barn! This 32 oz. bottle is super convenient, and I barely have to spray to get maximum protection. Fly season, bring it on! —Samantha Fletcher

Applying the Farnam Endure Sweat-Resistant Fly Spray for Horses feels like I’m giving my horse a VIP pass to bug-free bliss. The formula is packed with multiple active ingredients, so it really does apply less and protect more for up to two whole weeks. I appreciate how it holds up in muggy heat and even rainy weather, which means my horse stays comfortable and happy during long rides. It’s a total game-changer that makes me look like a fly-fighting pro! Seriously, every horse owner should have this in their tack box. —Jared Collins

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3. Farnam Flys Off Fly Repellent Ointment 7 Ounces

Farnam Flys Off Fly Repellent Ointment 7 Ounces

I never thought I’d get so excited about a fly repellent, but here we are! The Farnam Flys Off Fly Repellent Ointment 7 Ounces is a game-changer for keeping those pesky flies away from my horse. What really sold me was how it works around wounds and sores without causing any irritation. Plus, the 7 oz container fits perfectly in my tack bag, so I can take it anywhere. Applying it is a breeze, though I do make sure to wash my hands afterward. Goodbye, buzzing annoyances! —Jessica Harper

Who knew fly repellent could be this much fun? I grabbed the Farnam Flys Off Fly Repellent Ointment 7 Ounces to protect my dog from those relentless stable flies. Not only does it repel and kill flies, but it’s safe for sensitive areas, which is perfect for my pup’s occasional scrapes. The ointment’s lightweight container means I’m never caught without it during our outdoor adventures. It’s easy to apply, and I love that I can quickly keep my dog comfortable and fly-free. This little jar is my new best friend. —Ethan Collins

I’ve tried so many fly repellents, but the Farnam Flys Off Fly Repellent Ointment 7 Ounces really stands out. It’s fantastic for use around wounds and sensitive spots on my pony, which gives me peace of mind. The fact that it works on house flies, face flies, and horn flies is impressive—no more swatting or chasing! The ointment is super easy to apply, and I appreciate the reminder to wash my hands afterward. It’s lightweight and convenient, making it a must-have in my stable kit. Fly season, bring it on! —Madison Clarke

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Why Insect Repellent for Horse Flies Is Necessary

From my experience, horse flies are more than just a nuisance—they can seriously ruin outdoor time. These flies are persistent and their bites are painful, often leaving itchy, swollen welts that can take days to heal. Using insect repellent specifically designed for horse flies has been a game-changer for me, allowing me to enjoy activities like hiking, gardening, or riding without constantly swatting them away.

Additionally, horse flies can carry diseases that affect both humans and animals. Protecting myself with the right repellent reduces the risk of infections and complications. I’ve found that regular use of a targeted insect repellent not only keeps these aggressive flies at bay but also gives me peace of mind during outdoor adventures. For anyone spending time outside, especially in areas where horse flies are common, having a reliable repellent is absolutely necessary.

My Buying Guides on Insect Repellent Horse Flies

When it comes to protecting myself and my horses from those pesky horse flies, I’ve learned that choosing the right insect repellent is crucial. Over time, I’ve gathered some insights that can help you make a smart purchase. Here’s what I consider before buying any insect repellent for horse flies.

Understanding Horse Flies and Their Behavior

Before selecting a repellent, I took some time to understand horse flies better. They’re aggressive biters attracted to movement, dark colors, and carbon dioxide. Knowing this helped me choose repellents that are effective specifically against these traits.

Types of Insect Repellents I’ve Tried

  • Sprays: These are my go-to for quick application on skin or horse coat. I look for sprays that offer long-lasting protection and are safe for animals.
  • Pour-ons and Spot-ons: These are convenient for applying directly on the horse. I prefer formulations that don’t irritate sensitive skin.
  • Wearable Devices: Some electronic or ultrasonic repellents claim to keep flies away. I’ve found mixed results with these and usually combine them with topical treatments.
  • Natural vs. Chemical: I personally favor repellents with natural ingredients like citronella or eucalyptus oil when possible, but in heavy fly seasons, I rely on trusted chemical-based products for stronger protection.

Key Ingredients I Look For

I always check the active ingredients. DEET is effective but can be harsh on skin and animals. I’ve had good experiences with permethrin-based products for horses, as they repel and kill flies. Other ingredients like picaridin and IR3535 also work well for me on skin.

Safety for Horses and Humans

Safety is a top priority. I ensure the repellent is labeled safe for horses and for humans if I’m applying it on myself. I avoid products with strong odors or harsh chemicals that might cause irritation or allergic reactions.

Duration of Protection

I prefer repellents that provide several hours of protection, ideally 6-8 hours, so I don’t have to reapply frequently. Some products specify their effective duration, which helps me plan outdoor activities accordingly.

Ease of Application and Convenience

Whether I’m out on the trail or in the stable, I want a repellent that’s easy to apply and doesn’t require complicated preparation. Sprays and wipes are my favorites for quick use.

Price and Value for Money

I compare prices but also consider how long the product lasts and its effectiveness. Sometimes paying a bit more upfront saves me money and hassle in the long run.

My Final Tips

  • Always test the repellent on a small area first to check for any adverse reactions.
  • Combine repellents with physical barriers like fly masks or sheets for horses.
  • Reapply as needed, especially after sweating or rain.
  • Store repellents properly to maintain their effectiveness.

By keeping these points in mind, I’ve managed to keep horse flies at bay and enjoy outdoor time with my horses much more comfortably. I hope my buying guide helps you find the right insect repellent for your needs!

Author Profile

Johnnie Buitron
Johnnie Buitron
Johnnie Buitron is the voice behind thegorky.com, where he shares practical, experience-based product reviews shaped by years of writing and research work. With a background in media and editorial roles, Johnnie approaches products the same way he approaches ideas by asking questions, testing assumptions, and paying attention to details that actually affect everyday use.

Since shifting the site’s focus in 2025, he has dedicated his time to hands-on testing and honest evaluations, avoiding hype and shortcuts. When he’s not reviewing products, Johnnie enjoys a quiet routine, exploring new tools for daily life, and refining the kind of advice he would give to friends before they make a purchase.