Mosquitoes are an unavoidable nuisance during the warmer months, buzzing around relentlessly in search of their next meal. While we often think of these pesky insects as a problem for humans, dogs aren’t immune to mosquito bites either. Just like us, dogs can get bitten by mosquitoes, and while most bites cause nothing more than mild irritation, some can lead to serious health risks.

If you’ve ever noticed your dog scratching, licking, or acting restless after being outside, mosquitoes might be the culprit. These tiny pests are drawn to warm-blooded animals, and dogs—especially those with short or thin fur—can be an easy target. Mosquitoes tend to bite areas with less fur, such as the ears, nose, belly, and paws, making outdoor-loving pups particularly vulnerable.

But beyond the itchiness, mosquito bites can pose real dangers to dogs. Heartworm disease, spread by infected mosquitoes, is one of the biggest concerns—it can be life-threatening if left untreated. Some dogs may also develop allergic reactions.

How do mosquitoes affect dogs?

For dogs, mosquito bites can cause a range of discomforts and potential health concerns. While most bites result in minor irritation, some dogs may experience allergic reactions, excessive scratching, or even develop infections from constant licking and biting at the affected area.

The immediate effects of mosquito bites on dogs

Similar to how it is for humans, when a mosquito bites, it injects saliva into the skin, triggering the body's immune response. This leads to:

Itching and irritation – Just like humans, dogs may start scratching, licking, or biting at the bite site due to the itchiness.
Redness and swelling – The affected area may develop small, red, raised bumps, especially in less furry areas like the ears, belly, nose, and paws.
Restlessness or agitation – Some dogs may become irritable or anxious if they have multiple bites that won’t stop itching.

For most dogs, the irritation subsides within a day or two, but for others, mosquito bites can lead to bigger problems.

Dogs with sensitive skin may have worse reactions

Some dogs are more prone to skin sensitivities and allergic reactions from mosquito bites. This is particularly common in:

Dogs with allergies – Some dogs have hypersensitivity to mosquito saliva, leading to excessive swelling, redness, or even hives.
Short-haired or hairless breeds – Less fur means less protection, making breeds like Greyhounds, Whippets, and Chinese Crested Dogs more vulnerable.
Puppies and elderly dogs – Their immune systems may not be as strong, making them more prone to irritation and infections.

Are mosquito bites dangerous for dogs?

In some cases, it can lead to serious health risks. Mosquitoes don’t just cause irritation—they can also transmit diseases that pose a significant threat to your dog’s health.

Let’s take a closer look at the three biggest dangers of mosquito bites in dogs.

1. Heartworm disease

Of all the illnesses mosquitoes can spread, heartworm disease is the most dangerous and potentially fatal for dogs. Heartworm (Dirofilaria immitis) is a parasite transmitted by infected mosquitoes, and once inside a dog’s body, it grows into long, thread-like worms that invade the heart, lungs, and blood vessels.

Symptoms of heartworm disease in dogs

Persistent coughing
Lethargy and reluctance to exercise
Weight loss and reduced appetite
Laboured breathing or difficulty catching breath
In severe cases: heart failure and organ damage

Why is heartworm so dangerous?

Unlike other mosquito-borne illnesses, heartworm infections can take months or even years to show symptoms, meaning a dog may already have significant damage to the heart and lungs by the time it’s diagnosed.

Prevention is key! The good news is that heartworm disease is preventable with regular vet-prescribed heartworm medication, which is far easier (and safer) than treating an existing infection.

2. West Nile Virus (Rare but possible in dogs)

West Nile virus is a mosquito-borne disease that primarily affects humans, horses, and birds, but dogs can become infected as well—though cases are rare, and is not considered to be a fatal virus in dogs

Symptoms of West Nile Virus in dogs

Most infected dogs show no symptoms at all, but in rare cases, dogs may develop:

Fever and lethargy
Muscle weakness or tremors
Neurological issues (e.g., difficulty walking or seizures)

While most dogs recover without treatment, it’s still important to protect them from mosquito bites to reduce their risk of exposure.

3. Allergic reactions to mosquito bites

Some dogs develop hypersensitivity to mosquito bites. It can be especially uncomfortable for dogs with sensitive skin.

Symptoms of an allergic reaction to mosquito bites in dogs

Excessive swelling at the bite site
Intense itching and constant scratching
Skin redness or hives
Secondary infections from excessive licking or biting
Facial swelling
Vomiting
Severe diarrhoea
Lethargy

If your dog experiences an extreme reaction to mosquito bites, cool compresses, vet-approved anti-itch creams, or antihistamines (prescribed by a vet) can help.

How to protect your dog from mosquito bites

While you can’t eliminate mosquitoes entirely, you can take steps to reduce your dog’s exposure and keep them safe. Here’s how to protect your furry friend from these pesky insects.

1. Keep mosquitoes out of your home & yard

The first line of defence is to prevent mosquitoes from thriving in your environment. Mosquitoes breed in standing water, so eliminating potential breeding grounds can help reduce their numbers.

Remove standing water – Empty birdbaths, plant saucers, old tires, and any containers that collect rainwater.
Keep gutters clean – Clogged gutters hold water and become a perfect mosquito breeding ground.
Trim grass and bushes – Mosquitoes love damp, shady spots, so keep your yard tidy.
Install mosquito screens – Protect your home by using mosquito screens on windows and doors to keep insects out.

If mosquitoes are a big problem in your area, consider using pet-safe mosquito repellents around your yard or investing in mosquito traps.

2. Use pet-safe mosquito repellents

Not all insect repellents are safe for dogs—many human mosquito sprays contain DEET, which is toxic to pets. Instead, opt for vet-approved mosquito repellents specifically designed for dogs.

Mosquito-repelling sprays & wipes – Look for natural, dog-safe formulations that contain essential oils like citronella or lemongrass (but always check with your vet before use).
Mosquito-repellent collars – Some flea and tick collars also provide mosquito protection.
Spot-on treatments – Many vet-recommended topical treatments help repel mosquitoes alongside ticks and fleas.

🚫 What NOT to use:

DEET-based sprays – These can cause neurological issues and poisoning in dogs.
Essential oils without veterinary approval – Some natural oils (like tea tree and eucalyptus) can be toxic to dogs.

Our choice? Good Riddance insect repellents

While Good Riddance Insect Repellents are primarily for human use, their natural formulation makes them a pet-safe option for your dog. Unlike many essential-oil-based repellents, Good Riddance does NOT contain tea tree essential oil, which is known to be harmful to dogs. Instead, the Good Riddance Tropical range features Lemon Scented Tea Tree, a pet-safe alternative derived from a different plant species that effectively repels mosquitoes without irritating your dog’s skin.

If your dog has sensitive skin, you can opt for the Good Riddance Sensitive range, which is formulated for extra gentleness. A small amount applied behind the ears or on the belly can help provide added protection when mosquitoes are out in full force.

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Tip: Always do a patch test on a small area before applying any new product to your pet’s skin, and consult your vet if your dog has pre-existing allergies or sensitivities.

3. Keep dogs indoors during peak mosquito hours

Mosquitoes are most active at dawn and dusk, making these high-risk times for bites.

Try to limit outdoor walks or playtime during these hours.
If your dog needs to go outside, keep them in screened-in areas or mosquito-protected spaces.
Use fans in outdoor areas—mosquitoes are weak fliers, and a gentle breeze can help keep them away.

If your dog loves being outside, consider setting up a mosquito-proofed area with screens or netting to give them a safe space.

4. Use protective clothing for dogs

While it may sound unusual, mosquito-proof clothing can provide an extra layer of protection, especially for dogs that spend a lot of time outdoors.

Lightweight mosquito-proof dog shirts or bodysuits – These are made from breathable fabric that acts as a physical barrier against mosquito bites.
Mosquito-repelling bandanas – Some dog bandanas are infused with insect-repelling technology, offering extra protection.

5. Ensure heartworm prevention

Since heartworm disease is the most serious risk from mosquito bites, regular heartworm prevention is a must. Prevention is far easier and safer than treatment, which can be costly and difficult.

Give your dog monthly heartworm medication – Your vet can recommend oral tablets, chewables, or spot-on treatments that provide year-round protection.
Schedule annual heartworm tests – Even if your dog is on preventive medication, regular testing ensures they remain heartworm-free.
Use combination treatments – Many flea and tick preventatives also include mosquito protection.

Ask your vet about the best heartworm prevention plan for your dog based on your location and mosquito risk levels.

Conclusion: Keeping your dog safe from mosquitoes

Mosquitoes may be small, but their impact on your dog’s health can be significant. From itchy bites and allergic reactions to the serious threat of heartworm disease, these pests can cause more than just temporary discomfort. By minimising mosquito exposure, using pet-safe repellents, and ensuring your dog is on a heartworm prevention plan, you can drastically reduce their risk of mosquito-borne illnesses.

At the end of the day, your dog relies on you to keep them protected—so taking proactive steps now means more happy, worry-free adventures together.

March 18 2025, by Tatianna Gerard Can Mosquitoes Bite Dogs? What Every Pet Owner Needs to Know