Best Mosquito Repellents for Dogs

Mosquitoes: nature’s most annoying little pests. Not only do they buzz, bite, and ruin a perfectly good summer evening, but they also pose serious health risks to our fur babies. Just like humans, dogs can suffer from mosquito bites—and in their case, it can lead to dangerous illnesses like heartworm disease, West Nile virus, and allergic reactions. That’s why responsible pup parents wonder what are the best mosquito repellents for dogs.

Let’s break down the best mosquito repellents for dogs (and two you should never use), plus tips for keeping your canine comfortable all season long.

Why Mosquito Protection Matters for Dogs

While a single mosquito bite might just cause a temporary itch, the real risk is disease. Mosquitoes are the main carriers of heartworm larvae, which enter a dog’s bloodstream through a bite and eventually mature into long, spaghetti-like worms that lodge in the heart and lungs. It’s as gross as it sounds—and it can be deadly if left untreated.

Even outside of heartworm, mosquitoes can cause:

• Skin irritation and hot spots
• Allergic reactions
• Potential transmission of Zika or West Nile virus (though rare in dogs)

Bottom line: your dog needs mosquito protection, especially during the warmer months or if you live in a high-risk area.

Best Mosquito Repellents for Dogs

1. Vet-Approved Topical Treatments

Best for: All-around parasite protection

Products like K9 Advantix II or Vectra 3D are monthly topical treatments applied to your dog’s back. Not only do they repel mosquitoes, but they also protect against fleas, ticks, and lice—all in one swoop.

Why it works: These contain vet-approved insecticides like permethrin (which is safe for dogs but toxic to cats—more on that later!) and imidacloprid, which repel and kill biting insects.

Pro tip: Always read the label and buy the correct dosage for your dog’s weight!

2. Natural Mosquito Sprays for Dogs

Best for: A gentle, chemical-free option

If you’re the crunchy, natural type (no judgment—we’re with you), look for essential oil-based sprays made specifically for dogs. Brands like Wondercide, Vet’s Best, and Only Natural Pet use ingredients like:

• Cedarwood oil
• Lemongrass oil
• Peppermint oil

These natural oils smell amazing and are known to deter mosquitoes, fleas, and ticks without harsh chemicals.

Important: Never DIY essential oil sprays. Some can be toxic, even in small amounts!

3. Mosquito-Repellent Dog Collars

Best for: Long-lasting, low-maintenance protection

Mosquito-repellent collars, such as the Seresto collar, are infused with slow-release insecticides that provide up to 8 months of protection. While primarily used for fleas and ticks, many of these collars also help repel mosquitoes.

Why it works: It offers constant, all-over protection—great for active or outdoor dogs who don’t love sprays or topicals.

4. Dog-Safe Wipes

Best for: Quick touch-ups before outdoor time

Going for a walk at dusk? Grab a few dog-safe insect-repellent wipes. They’re convenient for applying to your dog’s legs, belly, and ears—common mosquito landing zones. Wipes are a smart solution for travel, hikes, or a quick backyard zoomie session.

5. Indoor & Outdoor Mosquito Control

Best for: Environmental protection

Mosquito control isn’t just about what you put on your dog—it’s also about reducing exposure. Here’s how:

• Use pet-safe citronella candles or mosquito traps in your yard.
• Eliminate standing water where mosquitoes breed.
• Consider installing mosquito netting around patios or dog beds for extra comfort.

Two Mosquito Repellents You Should NEVER Use on Dogs

Now for the no-no list—because some products that work for us humans are straight-up dangerous for dogs.

1. DEET (found in Off! and other human repellents)

DEET is the most common mosquito repellent for people—but it’s toxic to dogs. Exposure can cause:

• Vomiting
• Seizures
• Skin irritation
• Neurological damage

Even small amounts can be harmful, especially if your dog licks their fur or your cat loves to groom your dog.

Bottom line: Never use human bug spray on your dog.

2. Permethrin-Based Products for Cats (used on dogs by mistake)

Permethrin is safe for dogs in specific dog-only formulations, but it’s highly toxic to cats. If you have both cats and dogs at home, be very careful.

Using the wrong product—or letting your cat snuggle your freshly treated dog—can lead to tremors, seizures, or even death in cats.

Pro tip: Always consult your vet when choosing repellents in a multi-pet household.

How Else Can You Protect Your Pup?

Keep Your Dog on Heartworm Prevention

Mosquito repellents help reduce the risk, but they’re not a complete shield. Year-round heartworm prevention (like Heartgard or Sentinel) is essential—especially in warm or humid climates.

Avoid Mosquito “Hot Times”

Mosquitoes are most active at dawn and dusk. Try to schedule walks during the middle of the day or later in the evening when possible.

Groom Regularly

Keeping your dog’s coat clean and well-brushed makes it easier to spot bites, hot spots, or irritated skin early.

Watch for Symptoms

If your dog starts scratching, develops red bumps, or seems lethargic, call your vet. It might be more than just a bite.

The Final Woof: Pet Insurance to the Rescue

Let’s be honest—mosquitoes aren’t the only pest in a dog’s life. From unexpected skin allergies to emergency vet visits for weird bumps or bites, things can go sideways quickly.

Pet insurance is one of the smartest ways to protect your pup and your wallet. It helps cover:

• Emergency visits
• Illnesses like heartworm
• Medications
• Diagnostics and lab work

When your dog’s health is on the line, the last thing you want to worry about is the bill.

Protecting your pup from mosquitoes is just the start. Give your best friend the coverage they deserve with pet insurance that keeps you prepared for anything—because a healthy, happy dog is the best kind of peace of mind.

Explore your pet insurance options today and give your dog the care they deserve—rain, shine, or mosquito season! 

References:

https://www.heartwormsociety.org/heartworms-in-dogs

https://www.animalhumanesociety.org/resource/pet-friendly-mosquito-repellents-humans-can-use-too

https://mainstreetvetservices.ca/files/2020/05/Natural-Insect-Repellent-for-Dogs-2-recipes-April-2017.pdf

Disclaimer

The information contained on this blog is intended for informational and educational purposes only and should not be construed as medical advice. It is not a substitute for professional veterinary care. Always consult with your veterinarian before making any changes to your pet's health care or treatment plan.

The authors of this blog are not veterinarians and do not claim to be experts in pet health. The information provided here is based on our own experiences and research, as well as information from reputable sources. However, we cannot guarantee the accuracy or completeness of this information.

We encourage you to do your own research and consult with your veterinarian before making any decisions about your pet's health.