Mosquitoes are more than just a seasonal annoyance—they can pose serious health risks to your pets. Dogs and cats are both vulnerable to mosquito bites, which can lead to skin irritation, allergic reactions, and even life-threatening conditions like heartworm disease.
One of the biggest mosquito-related risks for pets is exposure to mosquito-borne parasites, especially heartworms, which can affect both dogs and cats.
At 1st Pet Veterinary Centers, we want to help you protect your pet with trusted, compassionate care. Whether you need prevention advice, treatment for bites, or ongoing heartworm protection, our veterinary team is here for you.
Do Mosquitoes Bite Dogs and Cats?
Yes. Mosquitoes can bite both dogs and cats, particularly around areas with less fur, such as the ears, nose, belly, and groin.
Even indoor pets aren’t completely protected. Mosquitoes can enter homes through open doors, damaged screens, or simply when people come and go.
Here in Arizona, mosquitoes can be a concern well beyond what we might traditionally think of as “mosquito season.” That’s one reason we recommend discussing year-round parasite prevention with your veterinarian.
Learn more about why year-round parasite protection is important.
What Can Mosquito Bites and Mosquito-Borne Parasites Cause in Pets?
Mosquitoes can cause direct skin irritation from bites, but they can also transmit mosquito-borne parasites. For dogs and cats, the most important example is heartworm disease, which is spread when an infected mosquito bites a pet.
Potential concerns include:
- Heartworm disease: Heartworms are mosquito-borne parasites that can live in a pet’s heart, lungs, and nearby blood vessels. Dogs are the most common host, but cats can be affected too—and feline heartworm disease can be difficult to diagnose and manage.
- Skin irritation and allergic reactions: Mosquito bites may cause redness, swelling, itching, or small raised areas on the skin. Some pets are more sensitive to bites than others.
- Secondary skin infections: Persistent scratching, licking, or chewing can damage the skin, potentially allowing a secondary infection to develop.
Important: Pets cannot get heartworms from drinking water containing mosquito larvae. Heartworm disease is transmitted through the bite of an infected mosquito.
If your pet develops coughing, difficulty breathing, unusual fatigue, decreased appetite, weight loss, or other concerning changes, contact your veterinarian.
How Mosquito-Borne Parasites Spread
Heartworms are not spread through food, drinking water, or casual contact between pets.
The heartworm lifecycle requires a mosquito.
When a mosquito feeds on an infected animal, it can pick up immature heartworm larvae. After the larvae develop inside the mosquito, they can be transmitted to another susceptible animal when that mosquito bites again.
This means even a dog or cat that rarely encounters other animals can still be exposed.
It’s also why mosquito control alone isn’t enough. Reducing mosquito exposure is helpful, but year-round heartworm prevention provides an important additional layer of protection.
Spotting Mosquito Bites on Dogs and Cats
Mosquito bites aren’t always easy to see beneath a pet’s fur, but you may notice:
- Small red or swollen bumps
- Persistent licking, chewing, or scratching
- Irritation around the ears, face, belly, or other sparsely haired areas
- Localized redness or swelling
- Increased sensitivity when the area is touched
If your pet has a mild skin reaction, prevent excessive scratching or licking and contact your veterinary team if you’re unsure how to manage it safely.
Avoid applying human anti-itch creams, topical medications, essential oils, or other products unless your veterinarian specifically recommends them for your pet.
If swelling is significant, the area becomes painful or infected, or your pet develops facial swelling, vomiting, weakness, difficulty breathing, or other concerning symptoms, seek veterinary care promptly.
What Mosquito Repellents Are Safe for Pets?
It’s understandable to want an extra layer of protection when mosquitoes are active, but not every mosquito repellent that’s safe for people is safe for pets.
Avoid applying human insect repellents to your dog or cat unless specifically directed by your veterinarian. Products containing ingredients such as DEET can be harmful if applied to pets or ingested through licking.
Essential oils and products marketed as “natural” aren’t automatically safer either. Cats in particular can be sensitive to certain essential oils, and concentrations vary considerably between products.
Instead, talk with your veterinarian about products appropriate for your individual pet.
If you’re unsure which parasite preventive is right for your dog or cat, learn more about understanding parasite preventive medication options, or ask your 1st Pet veterinary team for a personalized recommendation.
Reduce Mosquito Exposure Around Your Home
You can’t eliminate every mosquito, but you can make your home and yard less inviting to them.
Consider:
- Emptying containers that collect standing water
- Refreshing outdoor water bowls frequently
- Maintaining pools and water features appropriately
- Checking window and door screens for damage
- Keeping pets indoors when mosquito activity is particularly high
- Following veterinary recommendations for year-round parasite prevention
Remember that environmental mosquito control is helpful, but it doesn’t replace heartworm prevention.
Why Heartworm Prevention Matters for Dogs and Cats
Because a single infected mosquito can potentially transmit heartworm larvae, prevention is much safer than relying on avoiding mosquito bites alone.
For dogs, heartworm disease can cause serious damage to the heart, lungs, and blood vessels and may become life-threatening without treatment.
Cats are different. They are not the typical host for heartworms, but that doesn’t mean they’re protected. Even a small number of worms can cause significant illness in a cat, and treatment options are much more limited than they are for dogs.
That’s why prevention matters for both dogs and cats—including pets that live primarily indoors.
Your veterinarian can recommend an appropriate prevention and testing schedule based on your pet’s species, age, health, lifestyle, and current medications.
A Layered, Veterinary-Guided Approach to Mosquito Safety
The best protection combines several strategies rather than relying on one solution.
At 1st Pet, we recommend:
- Keeping pets on veterinarian-recommended heartworm prevention
- Following your veterinarian’s recommendations for heartworm testing
- Using only veterinary-approved mosquito or parasite products
- Reducing standing water around your home
- Keeping screens in good repair
- Monitoring pets for skin irritation or unusual symptoms
- Keeping regular wellness appointments
Prevention is particularly important because you may never see the mosquito that exposes your pet.
Protect Your Pet—We’re Here to Help
Mosquitoes may be tiny, but the diseases they can transmit aren’t.
Fortunately, protecting your dog or cat doesn’t have to be complicated. Year-round parasite prevention, routine veterinary care, and simple steps to reduce mosquito exposure can go a long way toward keeping your pet safe.
If you’re concerned about a mosquito bite, aren’t sure whether your pet is protected against heartworm disease, or need help choosing the right preventive medication, 1st Pet Veterinary Centers is here to help.
Schedule a primary care appointment with 1st Pet to discuss heartworm testing, parasite prevention, or any concerns about your pet’s health.
And if your pet develops difficulty breathing, collapse, severe weakness, significant facial swelling, or another sudden medical emergency, 1st Pet’s emergency veterinary teams are available 24/7/365 at our North Valley, Mesa, and Chandler locations.