Farnam Repel-X PE Concentrated Fly Spray for Horses, 16-oz bottle

By Farnam
Rated 4.3611 out of 5 stars
$19.95Chewy Price
$28.79Chewy Price
$18.95Autoship Price
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About This Item


  • Effective spray helps to repel horn flies, house flies, stable flies, horse and deerflies, gnats and mosquitoes, and kills on contact.
  • 1 quart of concentrate makes 8 quarts of ready-to-use fly spray.
  • Just add water to create fly spray.
  • Spray or wipe on your horse, stalls and around the barn.
  • Easy to use.

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Learn More About Farnam From Our Team of Experts

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Total Price: $59.44

About Farnam Repel-X Insecticide & Repellent Ready-to-Use Spray

Multipurpose Defense

Since 1957, Repel-X Insecticide & Repellent has been helping people protect horses, dogs, and their premises from flies, mosquitoes, ticks, fleas, and more. The dependable, water-based formula ensures a non-oily application for both animals and surfaces. Use it as either a spray or a wipe—it’s a multipurpose pest defense you can rely on.

Create a No-Fly Zone

Farnam’s No Fly Zone horse products provide comprehensive pest protection. The three-step approach includes the SuperMask II horse fly mask to BLOCK insects from your horse’s face, Endure Sweat-proof Spray to REPEL pests, and SimpliFly Feed-Thru Fly Control to REDUCE flies. Together, they help keep insects away from your horse’s face and body, act as a safeguard against six types of flies, gnats, mosquitoes, lice, and deer ticks, and prevent the development of house and stable flies. 

Dependable Protection

Fighting flies requires different solutions for different challenges. That’s why you’ll want to add Repel-X Insecticide & Repellent to your arsenal. This cost-effective option will help protect your horses, dogs, and their premises, all in one bottle.

Easy Application

Applying Repel-X Insecticide & Repellent is simple and easy. Start by removing any excess dirt from the animal, then apply directly as a light spray or wipe it on, avoiding eyes and other sensitive areas. If using as a surface or space spray, remove animals from the area before applying. Use a good sprayer to deliver a coarse, wet spray on targeted surfaces. Reapply every day for best results, and always refer to package safety recommendations before use.

About Farnam

For over 75 years, Farnam has been a leader in equine care. Their mission has always been to strengthen the bond between horses and humans with simple, effective, and innovative solutions. Choose Farnam horse products to help make every moment of your time together happier, healthier, and more enjoyable.

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Top IngredientsPrallethrin, Piperonyl Butoxide.Cypermethrin, Pyrethrins, Piperonyl Butoxide...Octanoic Acid: 5.0% , Nonanoic Acid: 5.0% , Decanoic Acid: 5.0% ...Water Based, Citronella ScentedCitronella Oil, Cedarwood Oil, Eucalyptus Oil, Other Ingredients.
Health FeaturePest ControlPest ControlPest ControlPest ControlPest Control

Questions & Answers

6 Customer Questions

this product works on donkeys. i have some miniture donkeys
Answer by ChewyMay 18, 2021
This spray is safe to use on donkeys, including miniature ones.

Will this kill wood bees ? they are eating my deck up.It safe to use around pets & plants?
Answer by ChewyMay 17, 2018
The spray would only work on flies, gnats, mosquitoes and ticks.

Can this be used on livestock?
Answer by ChewyJun 23, 2019
This spray shouldn't be used on livestock.

How often do you need to apply it?
Answer by ChewyMay 01, 2019
Repeat application every 3 or 4 days but not more than one treatment a day.

ReviewsWrite a Review

Rated 4.3611 out of 5 stars
36 Ratings
Would recommend to a friend

36 Customer Reviews

Rated 5 out of 5 stars
By CINDY on Oct 1, 2023


I like this fly spray for the horses and for some reason now it is hard to find. Glad Chewy has it. Fast delivery.

Rated 5 out of 5 stars
By Molly on May 7, 2023

Great Fly spray

Have used this for 40 years! Works great and Luke that I can make it more or less concentrated

Rated 5 out of 5 stars
By Tammie on Jun 25, 2023

Fly Spray

Great product, shipping & price

Rated 5 out of 5 stars
By 1Topangan on Oct 22, 2022

consistently effective

I have used this fly spray on all of my horses. I like it because you can use more or less water depending on the fly aggressiveness at the time.

Rated 5 out of 5 stars
By Hopefarms on May 25, 2022

I keep coming back to this fly spray!

I've tried almost ALL of them and I keep coming back to REPEL-X emulsifiable fly spray - it is cost-effective (especially if you have more than one horse) and is easy to use and as long as it isn't mixed too strong is not likely to "burn" your horses' skin (I do have one out of three that I need to be careful with). Buying it by the gallon is the most cost-effective and the quart is second best.

Rated 5 out of 5 stars
By chipita on Jun 2, 2022

Love Repel-x

I love it but thought I had cancelled three bottles since I had already ordered 3 previously......Somehow Chewy misconstrued my intention and now I have 6.....As I said.....I love Repel-x but am a little unhappy as I didn't mean to stock my shelves with only having 3 horses.....

Rated 5 out of 5 stars
By Kim on May 2, 2023

Love it

Works great

Rated 5 out of 5 stars
By Bostonmom on Apr 28, 2022

Farnam Repel-X concentrate

It really really works. I mixed it in a gallon milk jug so ready to use when I need it. I am in South Carolina and the bugs are already bad:(. This spray does kill on contact and keeps the bugs away at least for a while.

Rated 5 out of 5 stars
By Joyce on Jan 22, 2022

Great for a quick AM spray

Used Repel products for ever and they have always done good ...No fly Spray product works like they say but with this one i make in a gallon container and fill my sprayer as needed for a quick leg/belly and spine spray ...Its a daily need but cheap enough to do for 3 horses every morning and No problems with skin reactions with the water base and there is no disgusting embedded sand

Rated 4 out of 5 stars
By bugoff on Aug 20, 2021

used for years

This is the only product that does not cause hives on my horses. Been using it for decades. Like that I can mix it at differing dilutions depending of the pest. Found the best price on Chewy. Fast shipping too.