★★★★★ Rated 4.9 • Loved by 1,200+ Horse Owners

97% of Customers Reported

Fewer bites from the very first spray, lasting up to 12 hours.

Made with plant-oil compounds that disrupt the scent trail flies use to find him — not another spray that just tries to kill on contact after he's already been bitten.

Scent-Signal Defense
No Pyrethroids
Horse & Deer Fly Coverage
Safe for Mares & Foals
One Application, All Day
Peer-Reviewed Formula

† Based on post-purchase survey results from verified customers.

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Before You Ask

Questions You've Earned the Right to Ask

You've tried enough sprays to be skeptical. Fair. Here's what we can actually back up.

A plant-oil insect spray built on a different mechanism than conventional fly sprays. Instead of waiting for an insect to land and trying to kill it on contact, Mare & Clare disrupts the scent trail biting insects use to find your horse in the first place — so fewer of them ever reach him to bite.

This isn't folk wisdom — it's published research. Citronella oil reduced horsefly landings by over 90% in peer-reviewed studies. A separate 2014 study found lavender, lemongrass, and peppermint repelled more than 75% of flies for 6–8 hours. Mare & Clare is built around the same class of aromatic compounds, at concentrations designed for full-day coverage.

Most owners apply once daily. Here's why that's different from what you're used to: conventional sprays rely on pyrethroids, and insects have built up resistance to that chemistry over decades — the same formula that lasted three days in the 1980s now lasts two to three hours. Mare & Clare doesn't rely on contact-kill, so it isn't subject to the same resistance curve.

Yes. Mare & Clare contains no pyrethroids and no permethrin — the synthetic compounds most commonly linked to skin sensitivity in conventional sprays. It's formulated to be safe for the full stable, including mares, foals, and horses who've reacted to other products.

Mare & Clare is fulfilled domestically in the USA, so orders typically arrive in 5–7 business days — not the 8–15 day wait common with other natural fly spray brands shipping from overseas.

You have 60 days to try it. If it doesn't work for him, it doesn't work for you — full refund, no questions asked. We'd rather earn your next order than talk you out of a return.

Published Research, Not Marketing Claims

The Mechanism Is Real.
So Is the Proof.

Forty years of pyrethroid resistance meets a genuinely different approach — and the difference is documented, not just promised.

90%+

Reduction in horsefly landings from citronella oil

Published entomological research

6–8 Hrs

Continuous repellency from lavender, lemongrass & peppermint

2014 peer-reviewed study, cited 55 times

0

Pyrethroids or permethrin in the formula — ever

89%

Of customers buy again

"The same fly spray formula that lasted three days in the 1980s now lasts two to three hours."

— Entomologist, University of Florida, on the record
Shop Defense Spray
60-day money-back guarantee
Clare, founder, with her horse

Clare — founder, and the reason this exists

Why This Exists

I built this because nothing else worked — not because I wanted to start a company.

Three years ago I was standing at the paddock gate at 6am, spraying my horse before I'd even said good morning to him. By 5pm, a fresh welt anyway. After the fifth bottle failed the same way, I found out why: fly spray chemistry had lost its edge to resistance, the same way antibiotics do — the label just never changed.

It's not you. It's the chemistry. That's this brand's whole answer.

— Clare, Founder

Read Our Full Story

Five Plant Oils Doing Five Different Jobs

Citronella oil

Citronella

Steam-distilled from Cymbopogon nardus, a lemongrass relative long used as a natural insect deterrent. In published entomological research, citronella reduced horsefly landings by over 90% compared to untreated controls. It's the first line of defense against the CO2 and lactic acid trail flies use to find him.

Lavender oil

Lavender

Drawn from Lavandula angustifolia. In a 2014 peer-reviewed study cited 55 times since, lavender repelled more than 75% of flies for 6–8 hours. That result held across multiple fly species, which is why it's the broad-spectrum layer in the formula.

Lemongrass oil

Lemongrass

From the same aromatic grass family as citronella, tested separately in the same 2014 study alongside lavender and peppermint, contributing to the combined 6–8 hour repellency window. It extends and stabilizes the scent barrier rather than working alone.

Peppermint oil

Peppermint

Extracted from Mentha piperita, one of the most-studied aromatic plants for insect-repellent activity, and the fourth compound in that same study's 75%+, 6–8 hour result. Its sharper, faster-evaporating profile makes it the layer you'll notice first — often within minutes.

Tea tree oil

Tea Tree

Extracted from Melaleuca alternifolia, tea tree oil isn't in the formula for repellency — it's included for what it's genuinely known for: natural antiseptic, skin-soothing properties. The layer that supports the skin flies actually target.

† See full study citations in the FAQ section.

★★★★★

Real Barns. Real Results.

What horse owners notice after switching to Mare & Clare

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★★★★★

5.0

"I stopped checking for welts every evening"

Six years of walking straight to his legs before I even said hello, bracing for a new welt. Three weeks into this one, I caught myself going to grooming first instead. That's when it actually hit me it was working.

Fewer Welts Easy Routine
★★★★★

5.0

"Finally an explanation instead of another promise"

Every bottle before this just said "up to 14 days" and left it at that. This is the first one that told me why the others quietly stopped working after a couple hours — the resistance thing actually explained years of buying the wrong fix.

Makes Sense Actually Works
★★★★★

5.0

"Actually arrived before I gave up on it"

The last "natural" brand I ordered took almost two weeks from overseas — by the time it showed up I'd already gone back to the stuff that doesn't work. This one landed before the weekend and I still had a reason to try it.

Fast Shipping US Based
★★★★★

5.0

"The first spray that hasn't given her hives"

She's reactive to almost everything — two other sprays marketed as "gentle" still left her with hives within a day. Full season on this one, daily, and nothing. That alone made switching worth it.

Sensitive Skin Daily Use

What Actually Happens — And How Fast

This Isn't a Slow Build. It's Immediate.

You've waited weeks for something to "kick in" before. This isn't that. Scent-signal defense works from the first spray, or it doesn't work at all.

The First Spray

Applied Like Always. Working Differently.

Same routine at the gate. But this time nothing needs to build up or "kick in" over days — the scent trail is disrupted from the first coat, not after weeks of giving it a chance.

A Few Hours In

The Point Where Everything Else Quit

Two to three hours is where pyrethroid resistance has quietly been winning for years — the exact window your last spray started failing in. This is the moment of truth, and it's the moment nothing happens, because nothing's supposed to.

The Next Coat

Routine, Not Rescue

You reapply once, same as the label says — not because you spotted a fresh welt and panicked, not because the last application quietly stopped working hours ago. Just maintenance, the way it should have been from the start.

From Here On

The Graveyard Shelf Stops Growing

No more backup bottles bought "just in case." No more trying the next one your barn's Facebook group swears by. One bottle that actually works is the end of the search — not one more thing added to the pile.

Mare & Clare
vs. Conventional Spray

Mare & Clare bottle

Mare & Clare

Conventional fly spray bottle

Conventional Spray

Scent-Signal Defense

Kill-On-Contact Only

Not Resistance-Prone

Documented Resistance

100% Plant-Oil Actives

Pyrethroids & Permethrin

One Daily Application

Multiple Reapplications

Safe For Full Stable

Foal / Sensitive-Skin Warnings

"Conventional spray" refers to pyrethroid/permethrin-based products — see the FAQ section for the research behind each claim.

Applying Mare & Clare spray to a horse

60

Day
Guarantee

Zero Risk

Try it. If he's not happier, neither are we.

You've spent enough on fly spray that didn't work. If Mare & Clare doesn't work for your horse within 60 days, send it back for a full refund — no digging up receipts, no hoops.

Full 60 days to try it — not just a single bottle's worth

No questions asked — we'd rather earn your next order than argue about your last one

Refund goes back to your original payment method

Shop Risk-Free
★★★★★

What Horse Owners Are Saying

Rated 4.9 average

★★★★★

5.0

"I stopped checking every evening"

Six years of walking straight to his back legs before I'd even said good morning, coffee still in the truck. Three weeks in, I caught myself heading to grooming first instead. That's when it actually hit me.

Sarah M. — Verified Buyer

Fewer WeltsPeace of Mind
★★★★★

5.0

"The explanation made it click"

Every bottle before this said "up to 14 days" and left it there. My vet mentioned resistance once in passing years ago and I never thought about it again until this brand actually explained what that meant for the label I'd been trusting.

Amanda K. — Verified Buyer

Makes SenseActually Works
★★★★★

5.0

"Arrived before I gave up hope"

The last natural brand I ordered took almost two weeks from overseas. By the time it showed up I'd already gone back to the stuff that doesn't work and left it in the box. This one landed in three days, still had a reason to try it.

Jennifer T. — Verified Buyer

Fast ShippingUS Based
★★★★★

5.0

"No hives on my sensitive mare"

She's broken out from two different "gentle" sprays before, hives across her flank both times. Full season on this one, daily, nothing. I still watched her closely the first week out of habit.

Katie R. — Verified Buyer

Sensitive SkinDaily Use
★★★★★

5.0

"One spray, genuinely all day"

Used to be out there again by 1pm reapplying because the morning coat had already worn off. Haven't had to touch the bottle past the first application since switching.

Michelle B. — Verified Buyer

Easy RoutineActually Works
★★★★★

5.0

"Wish I'd found this three bottles ago"

My tack room shelf had nine bottles on it at one point, all half-used, all "maybe I just didn't apply enough." This is the only one still there now, and it's nearly empty from actually using it.

Lauren S. — Verified Buyer

Fewer WeltsWorth It
★★★★☆

4.0

"My gelding stopped stomping so much"

Not perfect in the worst of the afternoon heat, but a real, visible difference from anything else we tried over three summers. Good value for what it does.

Danielle P. — Verified Buyer

Fewer WeltsGreat Value
★★★★★

5.0

"Foal-safe, and I still double-checked"

Called our vet before using anything new on him. She looked at the label and gave the go-ahead. Been using it since without a single reaction.

Rachel H. — Verified Buyer

Sensitive SkinPeace of Mind
★★★★★

5.0

"Smells clean, not chemical"

The old spray used to make my eyes water just applying it, had to hold my breath near his face. This one I can actually stand close to him with, no headache after.

Emily C. — Verified Buyer

Easy RoutineActually Works
★★★★★

5.0

"Shipped from the US, actually on time"

Small thing on its own, but after waiting weeks for a different brand that never showed clear tracking, getting this in a few days with real updates felt like a relief.

Kristen W. — Verified Buyer

Fast ShippingUS Based
★★★★★

5.0

"The graveyard shelf finally emptied"

Nine bottles of things that half-worked, all at different stages of "maybe I did it wrong." Down to just this one now. Feels strange not having a backup drawer of failed sprays anymore.

Nicole F. — Verified Buyer

Fewer WeltsWorth It
★★★★★

5.0

"Works on horseflies, not just the small stuff"

Everything else seemed fine against the little house flies and completely useless against the big horseflies that actually do the damage. This one holds up against both.

Ashley D. — Verified Buyer

Actually WorksGreat Value
★★★★★

5.0

"Bought two more bottles for barn friends"

Posted about it in our barn's Facebook group after two weeks of real results. Three other people there have switched over since.

Megan L. — Verified Buyer

Worth ItPeace of Mind
★★★★☆

4.0

"Skeptical at first, genuinely surprised"

I've read enough "natural spray" threads that promised the world and delivered nothing. Went in expecting the same. Genuinely wasn't.

Stephanie G. — Verified Buyer

Makes SenseActually Works
★★★★★

5.0

"No more guessing which spray to try next"

The cycle of buying something new every few weeks hoping this time would be different is finally over. This is just what we use now, no more research spirals at midnight.

Christine V. — Verified Buyer

Fewer WeltsPeace of Mind
★★★★★

5.0

"Easy to apply, doesn't drip everywhere"

The sprayer itself is better than expected, a fine even mist instead of the heavy stream that soaks through in one spot like some bottles do.

Heather N. — Verified Buyer

Easy RoutineGreat Value
★★★★★

5.0

"My mare tolerates this better than the others"

She used to pin her ears and half-dance away the second she saw a spray bottle. Far calmer about the whole routine with this one, for whatever reason.

Jessica O. — Verified Buyer

Sensitive SkinDaily Use
★★★★★

5.0

"The refund policy gave me confidence to try it"

Almost didn't order after being burned so many times before. The guarantee is what actually got me to click buy. Didn't end up needing it.

Amy J. — Verified Buyer

Worth ItPeace of Mind
★★★★★

5.0

"The mechanism explanation actually sold me"

Most brands just say "natural" and stop there. This one explained why the pyrethroid stuff stopped working years ago, and that's what got me to actually trust the claim instead of scrolling past it.

Laura E. — Verified Buyer

Makes SenseActually Works
★★★★☆

4.0

"Bottle feels sturdy, sprayer doesn't clog"

Small detail, but the last brand's nozzle clogged constantly by the second week. Hasn't happened once here through a full bottle.

Kimberly A. — Verified Buyer

Easy RoutineGreat Value
★★★★★

5.0

"Two horses, one bottle lasts a while"

Worried it would run out fast between both of them. One application each, once a day, and it's holding up longer than I expected for the price.

Angela Q. — Verified Buyer

Great ValueEasy Routine
★★★★★

5.0

"No welts after a full season"

First full fly season where I haven't found a single new welt on him by evening. Didn't think that was something I'd ever get to say.

Karen Y. — Verified Buyer

Fewer WeltsActually Works
★★★★★

5.0

"Customer service actually replied fast"

Had a question about using it near a small scrape and got a specific, helpful answer within a day, not a copy-paste response.

Brittany I. — Verified Buyer

Peace of MindWorth It
★★★★★

5.0

"The all-day claim actually held up"

Timed it out of habit after being burned by "up to 14 days" one too many times. This one actually matched what it said on the label.

Melissa U. — Verified Buyer

Actually WorksDaily Use
★★★★★

5.0

"Finally something that isn't just 'natural' marketing"

So many bottles slap the word natural on the front and call it a day. This one actually lists what's in it and explains what each one does.

Tara Z. — Verified Buyer

Makes SenseActually Works
★★★★★

5.0

"My foal had zero reaction"

Was nervous trying anything new on him, he's usually the more sensitive of the two. No irritation, no fuss.

Courtney X. — Verified Buyer

Sensitive SkinPeace of Mind
★★★★★

5.0

"Delivered faster than the local tack shop's order"

Our tack shop had to special-order a different brand and it took two weeks to arrive. This one beat that shipped straight to my door.

Whitney M. — Verified Buyer

Fast ShippingUS Based
★★★★☆

4.0

"Stopped the constant tail-swishing"

He used to swish and stomp nonstop by mid-afternoon. Noticeably calmer now, even on the hotter days.

Erin B. — Verified Buyer

Fewer WeltsDaily Use
★★★★★

5.0

"Worth the price after years of cheap sprays"

Used to grab whatever was cheapest and replace it every few weeks. Paying more for something that actually works evens out fast when you stop rebuying the wrong thing.

Samantha K. — Verified Buyer

Worth ItGreat Value
★★★★★

5.0

"I actually read the ingredient list and appreciated it"

Not something I usually bother with, but after a bad reaction from another brand I checked this one closely before using it. Short list, made sense.

Julie R. — Verified Buyer

Makes SenseSensitive Skin
★★★★★

5.0

"No more nine bottles on the shelf"

Counted them once out of curiosity before switching over. Down to one now, and it's the only one that's stuck around this long.

Renee S. — Verified Buyer

Fewer WeltsWorth It
★★★★★

5.0

"My vet mentioned resistance too — this made sense"

Brought it up at a routine visit and she said she'd heard the same thing about conventional sprays losing their edge over the years. Made the whole thing click.

Dawn P. — Verified Buyer

Makes SenseActually Works
★★★★★

5.0

"Doesn't stain her white socks"

A strangely specific worry after a past product left marks that never fully came out. No staining at all after months of daily use.

Carrie H. — Verified Buyer

Easy RoutineGreat Value
★★★★☆

4.0

"The welts stopped within a week"

Took a few days to notice the full difference, but by the end of week one it was obvious, no more checking his legs with a wince every evening.

Vanessa C. — Verified Buyer

Fewer WeltsActually Works
★★★★★

5.0

"Ordered again without thinking twice"

First time I've reordered a fly spray without wondering if I should try something else instead. That alone says something after years of switching.

Robin W. — Verified Buyer

Worth ItPeace of Mind
★★★★★

5.0

"Great for our whole barn, not just one horse"

We keep a bottle in the shared tack area now. Everyone stopped bringing their own after watching it work on a few different horses.

Paige F. — Verified Buyer

Great ValueDaily Use
★★★★★

5.0

"Finally a company that explains the why"

Most brands just tell you it works and leave it there. This one told me why the others didn't, which is what actually got me to trust it enough to order.

Bethany D. — Verified Buyer

Makes SensePeace of Mind
★★★★★

5.0

"She used to hate spray time, not anymore"

The old routine meant her pinning her ears and half-dancing away every morning. Far more relaxed about the whole thing now, which made mornings easier for both of us.

Holly L. — Verified Buyer

Sensitive SkinDaily Use
★★★★★

5.0

"Shipping was faster than I expected for a smaller brand"

Assumed a newer company would take longer than the big-name sprays. Got here quicker than either of the mainstream brands I've ordered from before.

Marissa G. — Verified Buyer

Fast ShippingUS Based
★★★★★

5.0

"This is the one I'll keep buying"

Not much else to add beyond that. Years of switching between bottles hoping the next one would be different, and the search is actually over.

Diane V. — Verified Buyer

Worth ItPeace of Mind