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Ecovet Fly Repellent Horse Spray

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Help protect your horse from annoying pests with the Ecovet Fly Spray Repellent. Formulated with a proprietary blend of fatty acids and silicone oil, it effectively and naturally repels flies, mosquitoes, ticks, no-see-ums and even lice. It works by forming a natural barrier around horses to repel pests that are not only annoying, but can actually transmit diseases, as well as trigger stress and allergies. Since it’s made with naturally derived fatty-acids without toxic chemicals or pesticides, it’s safer for both horses and their owners, and won’t irritate sensitive equine pals—in fact, it’s clinically shown to improve itching from biting midges. Applying it is simple and quick with its easy-to-hold spray bottle, and because it offers long-lasting protection, you only need to apply every two to three days. In addition to establishing a pest-repelling zone around your horse, it adds a natural fragrance of sage and lavender. Plus, its formula is safe for the environment with no known toxicity for honeybees.

Key Benefits
  • Effectively repels flies, biting midges, mosquitoes, ticks, no-see-ums, and even lice and cockroaches, with naturally derived fatty acids and silicone oil.
  • Forms a repelling barrier that prevents pests from landing on your equine pal with just one application every two to three days.
  • Non-sensitizing, EPA-approved formula contains no harmful chemicals, toxins, or pesticides so it’s safe for horses, humans, and honeybees.
  • Easy-to-hold application system for easy, no-mess, spray-on protection that also smells great with sage and lavender.
  • Made by a veterinarian-owned company so it’s tested and endorsed by experts.

Keep out of reach out children. Hazardous to humans and domestic animals. Causes moderate eye irritation. Breathing of mist may cause respiratory irritation. Avoid contact with skin, eyes, or clothing. Wash thoroughly with soap and water after handling and before eating, drinking, chewing gum, using tobacco, or using the toilet. Remove contaminated clothing and wash before reuse. When applying to animals stand up wind from the subject being treated and avoid contact with delicate areas such as eyes and ears.

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  • Item Number

Octanoic Acid: 5.0% , Nonanoic Acid: 5.0% , Decanoic Acid: 5.0% , Other ingredients: 85.0%


1) Do not dilute Ecovet Fly Repellent prior to use or combine or co-apply with any other skin treatments, including soaps and detergents.

2) Apply to individual animals while standing upwind from the subject being treated.

3) Apply to hair coat using any commercially available small sprayer suitable for oil application or using a soft cloth.

4) Apply with care around delicate areas (eyes and ears). If animals have been washed, allow treatment areas to dry before application.

5) To repel flies and ticks, apply to horse's front and rear legs and lower body. Apply with care around eyes and ears.

6) Do not apply when horses are sweating profusely.


What makes Ecovet work so well?

Bugs use scents to find things. Some odors attract bugs and some repel them. The food-grade fatty acids that we use mimic some of the repellent smells that animals naturally have on their skin. We are essentially using the bug's own navigation against itself by overwhelming that system. View the "Ecovet Explainer" video to learn more: bit.ly/ecovetvideo

What are the ingredients in Ecovet?

Ecovet is an EPA-registered product made from three naturally derived, food-grade fatty acids that are carried in a silicone base liquid.

The label only lists the active ingredients and says 85% are "other ingredients." Can you tell me what those other ingredients are?

Yes! Ecovet is made of:

  • Three food-grade fatty acids (5% each for a total of 15%) (Octanoic and Decanoic are from palm kernel oil. Nonanoic is from beef tallow.)
  • 84% silicone oil
  • 1% fragrance

The silicone oil's job is to carry the fatty acids during application to the horse. There are a lot of different types of silicone oil as this is a very versatile compound. It is used primarily in the cosmetics and hair care industries as a detangler or to provide a lasting sheen to the coat. Our formulation is a volatile silicone oil. When exposed to the horse's skin and normal body temperature, it totally evaporates in about 20 to 30 minutes, leaving just the fatty acids. The silicone does not have any real drying properties that would affect the skin.

So what is a fatty acid anyway?

In chemistry, particularly biochemistry, a fatty acid is a chain of carbon atoms that are associated with hydrogen atoms. They can be either saturated or unsaturated with the hydrogen atoms. They serve many purposes in the body. Fatty acids are important sources of fuel because, when metabolized, they yield large quantities of energy. Many cell types can use either glucose or fatty acids for this purpose. They are also important in the walls of cells.
Saturated fatty acids (the active ingredients in Ecovet) have no double carbon bonds and are not prone to breakdown. They are very stable at room temperature. Unsaturated fatty acids, on the other hand, can combine with oxygen. This leads to degradation and they become rancid.

What makes up the Ecovet fragrance?

The fragrance is a proprietary mixture of scents made primarily from essential oils.

I heard that Ecovet uses palm kernel oil. I have concerns about palm oil production, and the horrible decimation of the forests by those trying to capitalize on the popularity of this ingredient in so many products now. What's your source?

We get our palm kernel oil from Emery Oleochemicals. Here is an explanation from Emery about Ecovet ingredients:

The C8, 10 acids are derived from palm kernel oil from palm trees on plantations in Malaysia. It is very important to note that Emery is a member of RSPO (Roundtable on Sustainable Palm Oil), which means that we are certified that our palm kernel oil comes from sustainable farming in plantations and not as a result of depleting the rainforest (unsustainable.)

The C9 in Ecovet is derived from tallow.

If Ecovet works so well against the nasty flies, what does it do to the beneficials?

I use Fly Predators, and I would hate to do something bad to them.

Ecovet does not seem to affect Fly Predators for two reasons: (1) Fly Predators are actually a species of parasitic wasp (Ecovet does not affect bees and wasps to an appreciable extent), and (2) the wasp typically is near poop piles and not on the animals themselves.

Is Ecovet safe to spray on wounds?

My horse had a boo-boo this week and has a few stitches and some other scrapes.

We have not specifically tested Ecovet on open wounds. Clinically speaking, we have had cases where it was impossible to treat the horse without some landing on the wound itself. Bottom line: We cannot advocate spraying directly on the wound but overspray has not shown any adverse effects that we know of at this time. Interestingly, there are current fatty acid skin products on the market that promote healing of wounds.

I ordered Ecovet and the label warnings make it sound very toxic. Why does it have water runoff warnings?

As an EPA-registered product, we are mandated to carry basic precautionary statements. (Some essential oil products have been grandfathered in, so they are not required to carry these warnings at this time.) The statements do sound pretty scary. Initially the EPA had no restrictions around use of Ecovet in water, but when we discussed the possibility of transporting extremely large volumes (truck/train loads), they required a warning in case there was a massive spill. Every product has some toxicity in large enough amounts when released into the environment unexpectedly. In truth, fats and water do not mix well so it would take a very large amount.

What types of insects and pests will Ecovet repel?

It repels and kills mosquitoes, flies, ticks, no-see-ums (which cause difficult-to-treat allergies) and cockroaches. Recent testing has confirmed a very low toxicity to honeybees.

How often do I need to apply Ecovet to my horse?

Ecovet is long-lasting — you typically only need to apply it every one to three days depending on ambient temperature, fly pressure and rain. For certain conditions, such as sweet itch, Dr. John usually recommends initially treating the horse twice a day until the problem is under control. Because Ecovet works by evaporating and creating a repellent vapor barrier, if the horse is sweating, it may evaporate slightly faster. For more application tips, view the How to Apply Ecovet video: bit.ly/ecovetapply

My horse is a bug magnet and is super-allergic. What's the best way to use Ecovet to help her?

Focus on treating the regions that are giving her the most trouble (usually mane, tail head and ventral abdomen). To start, apply a liberal amount until control is achieved. For an allergic horse, it may be best to start with twice-a-day treatments focusing on these regions. Sometimes using a soft cloth or mitt allows for a more effective way to apply Ecovet. Read Dr. John's blog post for more details on helping the allergic horse: bit.ly/ecovet-sweet-itch

How long does Ecovet take to work?

Its repellent effect is usually immediate but the insecticidal properties may take up to 24 hours to occur.

What is the shelf life of Ecovet?

The active ingredients in Ecovet (saturated fatty acids) are very stable and do not become rancid. We have bottles 3+ years old that are still effective.

Why did Ecovet make me and my horse sneeze?

The fatty acids in Ecovet, when delivered in spray form, do react with a small number of horses and people. Most describe it as a "sticking" sensation that does go away.

Is Ecovet available outside the United States?

Ecovet is only available in the United States at this time. We will post any updates about availability to our Facebook page: facebook.com/ecovetforhorses

Can I use Ecovet on pregnant or nursing mares? Foals?

We can't claim safety for pregnant or nursing mares or foals because we have not specifically done this testing. However, we have heard a lot of anecdotal reports of safe, effective treatment of these groups. Remember: A little Ecovet goes a long way!

Can I use Ecovet on my dog to protect him from ticks?

While Ecovet is effective against ticks, it is currently only approved for use on horses and cattle. We suggest you talk with a trusted veterinarian re: parasite protection for your small-animal companions.

Is Ecovet safe to use if one is pregnant?

While we have done all the studies needed for the EPA for risks associated for human exposure, we did not specifically test Ecovet in either pregnant horses or humans. As such, we cannot comment directly on this. However, to date, we have not heard of any adverse reactions.

I sprayed my horse in the pasture and noticed later that the grassy area right where I sprayed looked like it turned brown, is this normal?

The Nonanoic fatty acid can cause grass to die in high temperatures and high humidity situations. It is best not to spray around grassy areas.

Does the fatty acids that remain after the silicone evaporates affect tack at all? Also, if a horse is wearing medicine boots, will the fatty acids break down the neoprene?

The fatty acids will not cause any break down of any known materials. It will rarely leave a white residue that can be easily wiped off.

Can I use Ecovet on other farm animals like pigs, chickens, goats, etc.?

At this time, as an EPA registered pesticide, Ecovet only has authorization for use on horses and cattle. We cannot approve its use on other animals. We have heard reports, however, that when used on other animals there has not been any adverse reaction.

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