☀️ SUMMER SALE ☀️ 50% OFF + FREE SHIPPING ON 2+ · ENDS SOON

HEALTH · SAFETY · INVESTIGATION
The FDA Put a Seizure Warning on America's Best-Selling Flea & Tick Chews — Most Dog Owners Still Haven't Heard About It

Bravecto. NexGard. Simparica. The pills millions of dogs swallow every month carry an official FDA alert for muscle tremors, ataxia and seizures — and a growing number of holistic vets are quietly moving their patients off them. Here’s what the label doesn’t spell out.

By Jenny C. · With contributions from Dr. Nathan Hargrove, DVM · Last updated August 28, 2026 · 6 min read

Monthly chews turned parasite prevention into a subscription — one the FDA has since put a warning on.

If your dog is on a monthly flea and tick chew, there’s a sentence buried in its paperwork you were probably never shown. In 2018, the U.S. Food & Drug Administration issued an alert covering the entire isoxazoline class of flea and tick products — the family that includes Bravecto, NexGard, Simparica and Credelio.

The reason: reports of neurologic adverse reactions — muscle tremors, ataxia, and seizures — in dogs taking them. The FDA required new label warnings across the class, and its own fact sheet, updated as recently as 2023, notes that seizures may occur even in dogs with no prior history.

"Seizures may occur in animals without a prior history." — U.S. FDA fact sheet on isoxazoline flea & tick products
How did this become the default?

Follow the incentives. Flea and tick prevention is a multi-billion-dollar market built on repeat purchases: a chew every month or a refill every quarter, for the life of your dog. And the product doesn’t repel ticks at all — it moves a pesticide into your dog’s bloodstream so the tick dies after it bites. Miss a dose and coverage collapses; keep dosing and your dog carries the chemical for life.

To be fair: the FDA still considers these products safe for most dogs, and many dogs take them without visible issues. But "most dogs" is doing a lot of work in that sentence, says Dr. Nathan Hargrove, DVM, a Georgia-based veterinarian who spent 14 years in conventional practice before switching to integrative medicine. "I prescribed these chews for a decade. Then I started keeping a tally of the tremor and seizure cases walking through my door — and the number stopped making sense."

WHAT THE RECORDS ACTUALLY SHOW

2018
The year the FDA first alerted owners to neurologic reactions in the isoxazoline flea & tick class — with new label warnings required.

Seizures
Reported in dogs on these products "without a prior history," per the FDA’s own fact sheet — alongside muscle tremors and ataxia.

Billions
The size of the flea & tick medication market — built on monthly and quarterly refills for the life of your dog.

After the bite
How chews work: the pesticide sits in your dog’s blood, so ticks are only killed once they’ve already bitten and fed.

Sources: U.S. FDA Animal Drug Safety Communication & isoxazoline fact sheet · AVMA / JAVMA News · industry market reports.
The question holistic vets started asking

"If a product carries a seizure warning, needs a dose every month for life, and doesn't stop the bite in the first place — is it really prevention?" Dr. Hargrove asks. That question is pushing a wave of integrative vets back toward the older answer: don't poison the tick after it bites. Repel it before it ever climbs on.
Repel-first isn’t new — it’s just been out-marketed

Aromatic plant oils like cedarwood, citronella and clove have been used against biting insects for centuries, and modern lab studies show them repelling ticks — the CDC even helped develop nootkatone, a compound found in cedarwood, as an insect and tick repellent. "Once I dug into the research on essential-oil repellents, I couldn't believe how much solid data was just sitting there, ignored by the industry," says Dr. Hargrove. "There's no monthly refill to sell — which may explain why you've never seen an ad for it."

Dr. Hargrove now recommends plant-based repellent sprays to every client who walks through his door. "When I found FurSure, I finally had something I could hand a pet parent and say: this works, and it won't hurt your dog."

THE REPEL-FIRST ALTERNATIVE
Meet FurSure™ — it repels before the bite, not after

A single clip-on pendant that repels fleas, ticks, and mosquitoes for up to 12 months — powered by six botanical oils, with nothing absorbed into the bloodstream, nothing on the skin, and no monthly refill to remember. One pendant. One decision. A whole year covered.

✓ Repels before the bite   ✓ 100% botanical oils   ✓ Up to 12 months   ✓ Waterproof   ✓ Takes 10 seconds

★★★★★  4.8 · 52,833+ reviews
FurSure — 12 Months Flea & Tick Free

$39.99  $80   SAVE 50% 

Price increase soon · Low stock (36 left)

ADD TO CART — PROTECT MY DOG →

🚚 Free shipping on 2+   ·   ↩ 30-day money-back   ·   4–7 day delivery
Why owners who switch never go back

 

FurSure

Chemicals

How it works

✓ Repels before bite

✕ Kills after bite

Ingredients

✓ 100% natural oils

✕ Harsh chemicals

Lasts

✓ 12 months

✕ 1 month

Side effects

✓ None

✕ Many health risks

To use

✓ Takes 10 seconds

✕ Hassle to apply
1. One clip-on, up to 12 months of coverage

No monthly reminders, no gaps when you forget a dose. Clip it onto any collar and it stays active through the whole extended season — spring thaw to first hard freeze and beyond.
2. Nothing enters the bloodstream or skin

FurSure repels externally from a sealed pendant instead of dosing your dog internally. No permethrin, no synthetic pesticides your dog carries against your kids and furniture every day.
3. Waterproof — baths, rain, and swimming

The oils are sealed in a waterproof casing. No removal, no fade after the first hour. It keeps working wet or dry, which matters when the yard is damp more months of the year.
4. Works from day one

Clip it on and it is active immediately. No loading period, no monthly pill to time — just continuous, external protection for as long as your dog wears it.
Six botanical oils

Cold-pressed from plants grown in mineral-rich, high-altitude soil to preserve their natural potency — which is why one sealed pendant keeps working for up to a year.

🌿 Javanese Citronella

🌿 Tasmanian Eucalyptus

🌿 Mountain Peppermint

🌿 Alpine Chamomile

🌿 Himalayan Cedarwood

🌿 Maluku Clove

✕ No permethrin   ✕ No synthetic pesticides   ✕ No neurotoxins

Third-party tested and safe for all breeds and ages — including puppies from 8 weeks, seniors, and sensitive breeds.
52,833+ dog owners have made the switch

★★★★★

Maria Clarke ★★★★★ · 6h ago

"Was the biggest skeptic — I’ve tried natural and none of them did anything. With FurSure I actually stopped finding ticks on my girl. 8 months in and it’s been a total lifesaver!"

Jenny Collins ★★★★★ · 16h ago

"My boy was vomiting every month after his flea chew and I was desperate. Three months in, no ticks, no vomiting, and he’s eating his breakfast again. Ordered two more for my other dogs."

Linda Bell ★★★★★ · 6h ago

"I was spending $15 a month plus vet bills for her stomach issues — over $700 a year to slowly poison my own dog. One FurSure pendant lasts 12 months. I only wish I’d found it sooner."
Frequently Asked Questions
Is FurSure safe for dogs and puppies?

Yes — FurSure is third-party tested and contains only natural botanical oils. Nothing enters the bloodstream and nothing touches the skin; it works externally from a sealed pendant. Safe for all breeds, sizes, and ages, including puppies from 8 weeks, senior dogs, and sensitive breeds.

How long does it last?

Up to 12 months of continuous protection from a single pendant. No monthly pills, no reapplying, no calendar reminders — clip it on and your dog is covered for the year.

Is it waterproof?

Yes. The oils are sealed inside a waterproof casing, so your dog can swim, get caught in the rain, or have a bath and the pendant keeps working. No need to remove or reapply.

Does it protect against heartworm?

FurSure repels the mosquitoes that carry heartworm, cutting off the main transmission route before it starts. For intestinal worms, many owners pair it with a natural dewormer for complete chemical-free coverage.

What if it doesn't work for my dog?

You're covered by a 30-day money-back guarantee. Try it risk-free — if you're not happy with the results, contact us for a full refund. No hoops, no hassle.

🎁 FREE GIFTS WITH YOUR ORDER
Get ahead of a longer tick season

50% OFF FOR A LIMITED TIME ONLY!
One $39.99 pendant covers your dog for the whole year. Stock keeps selling out.

PROTECT MY DOG — GET 50% OFF →

✓ Free shipping on 2+   ·   ✓ 30-day money-back   ·   Sell-out risk: HIGH

Disclaimer: The statements on this page have not been evaluated by the Food and Drug Administration. FurSure products are not intended to diagnose, treat, cure, or prevent any disease. Health statistics referenced are drawn from public reporting by the CDC, NYC Department of Health, and academic institutions, and are provided for general awareness only. Some testimonials may include customers who received free products in exchange for their honest review.

© 2026, FurSure