Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Heartworm Prevention for Cats: 3 Vet Approved Methods

Sick cat in animal hospital

Of all the diseases our cats can suffer from, heartworm disease is one of the worst. This disease is transmitted by mosquitoes that carry heartworm larvae that burrow into the body and can go on to grow up to 12 inches long and live in the lungs, heart, and blood vessels. The result is organ damage, lung disease, and heart failure.

Though cats are atypical hosts for heartworms (meaning they get heartworms less often than dogs, and worms usually don’t make it to the adult stage if a cat is infected), heartworm disease is still a significant concern for feline parents. Even worms that aren’t adults can cause damage to your cat, particularly in the form of what is known as heartworm-associated respiratory disease (HARD). And because immature worms are more difficult to detect, heartworm disease in cats can often go undiagnosed.

Since treatment of heartworm disease in cats is difficult and expensive, the best way to avoid it in your favorite feline companion is by preventing heartworms in the first place. But how can you do that? Below you’ll find three ways you can help prevent heartworms in your cat.

divider cat paws oct 2024

The 3 Ways to Prevent Heartworm in Cats

1. Heartworm Medicine

Woman at home is giving a special medicine
Image Credit: Veera, Shutterstock

Absolutely the best and easiest way to prevent heartworms in your pet is by giving him or her heartworm medication. If you’re located where there are lots of mosquitos year-round, vets recommend you give this medication to your cat monthly.

There are several types of heartworm medications available (which are sometimes combined with flea and tick medication), so you shouldn’t have issues finding one that works well for your pet. A monthly product is the easiest and best way to prevent heartworm disease and is simple to do.

Before giving any new medication to your cat, we recommend you consult a veterinarian for the best advice on which would be the best treatment option.

If you need to speak with a vet but can't get to one, head over to PangoVet. It's an online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

PangoVet_Mention-in-Content for PangoVet2 save money


2. Keep Cats Indoors

cat watching bird on the window
Image Credit: Andrzej Puchta, Shutterstock

Another way to help prevent heartworms in your feline friends is by always keeping your cats indoors. It’s not impossible for a mosquito to get into your home, but you’ll have far fewer of these bloodsuckers indoors than outside. This method of prevention isn’t as fool-proof as giving your pet heartworm medication, but it can go a long way in helping reduce your pet’s chances of getting heartworm.


3. Mosquito Control

man fogging with disinfectant
Image Credit: triocean, Shutterstock

You can also try controlling your local mosquito population. This prevention technique is a bit more difficult than the other ways of preventing heartworms, but it is possible. And you’ll appreciate having fewer mosquitos around as well! We will take a closer look below at how you can reduce the number of mosquitos around your home.

divider cat paws 2 oct 2024

Tips for Controlling the Mosquito Population

One of the best ways to keep mosquitos off your property is by getting rid of standing water since this is where mosquitoes lay their eggs. This includes emptying birdbaths, flowerpots, buckets, kiddie pools, trash cans, etc. If you can’t empty an item containing standing water, you can cover it with a tight lid. Another area where standing water can occur is in tree holes, so fill those in so they don’t end up holding water. Finally, if you have a septic tank, you’ll want to check it over for any gaps or cracks and repair those you find.

Your other options for preventing mosquitos are using larvicide to treat standing water that is too large to empty out or cover up to prevent mosquito eggs from hatching. You can also use insecticide to kill off adult mosquitos.

divider cat paw scratch oct 2024

Conclusion

It’s important to prevent heartworms in cats, as there is no treatment for this disease in felines. While cats are atypical hosts that don’t get heartworms often and don’t have heartworms grow to adult size, if they do get them, they’re still at risk for health complications from these parasites.

The best and easiest way to prevent heartworms in your pet is via heartworm medication, but you can also keep your pet indoors at all times and try controlling the mosquito population around your home. Controlling the mosquito population is a bit of work, but you can reduce how many mosquitoes are around by getting rid of standing water or treating areas with larvicide or insecticide.


Featured Image Credit: Kachalkina Veronika, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.

How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.

Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

8 Common Types of Cat Brushes (With Pictures)

Cats are known for their fondness for grooming and keeping themselves clean, but there are times we cat parents need to lend them...

Catster Photo Contest: Cats of the Week Winners (August 21, 2025)

Every week our team gets the privilege of sorting through our readers photos to choose what cats will win this weeks contest! See...

Vestibular Disease in Cats: Causes, Signs, & Treatments (Vet Answer)

It can be quite alarming to suddenly see your beloved cat exhibit a tilted head, eyes darting back and forth wildly (nystagmus), and...

Can Cats Get High? Vet-Reviewed Facts on Effect and Safety

Marijuana may be legalized for recreational use throughout Canada, 23 U.S. states, and the Australian Capital Territory, but that doesn’t mean it’s something...

More related

What Is the Cost to Remove a Cat Tooth? 2025 Price Guide

Part of caring for a pet cat is ensuring their dental health is monitored and managed as time goes on. Your veterinarian likely...

What Is the Best Kind of Rope for Cat Scratching Posts? 5 Options & Tips

If you’re a cat owner, you know that they love to scratch and that it’s an essential and instinctive behavior. Rather than try...

How to Stop My Cat From Bullying My Other Cat: 7 Vet-Reviewed Tips & Tricks

Owning more than one cat can be fulfilling and joyful, but in some cases, it may also prove to be a challenge. Like...

How Long After Flea Treatment Can I Pet My Cat? Vet-Approved Facts & FAQ

Fleas are a pain for many pet owners. Though fleas can strike all year round, you are most likely to see them during...

Keep reading

Why Do Cats Stretch Their Claws? 7 Vet Reviewed Reasons & Tips

If you’ve been around cats, it’s evident they’re closer to their wild roots than dogs. While humans welcomed canines into their lives up to 40,000 years ago,1 it took us longer to warm up to felines, with domestication going back...

cat paws and sharps claws

Do British Shorthair Cats Shed More Than Average? Vet-Reviewed Breed Comparison & Helpful Tips

British Shorthair cats don’t shed more than average. Compared to other shorthair cats, their shedding is about even. Usually, they shed more during the spring and fall, when their coat is adjusting to the shifting seasons. You will probably find...

british shorthair

Why Is My Cat Panting After Giving Birth? Vet Approved Facts & FAQ

Breeding your cat is a beautiful experience both for you and your cat. And while being pregnant is exciting, giving birth can be challenging for your furry friend, especially if she gives birth to multiple kittens. After giving birth, many...

fluffy cat pregnant give birth and new born baby kittens_iarecottonstudio_shutterstock

Can a Cat Detect Seizures? – What You Need to Know!

Most people know that certain dogs qualify as service animals under the Americans with Disabilities Act (ADA). Dogs have the ability to detect seizures in humans before they happen, and these dogs are known as seizure-alert dogs. While this ability...

Domestic cat lying on owner's lap

Cat Yeast Infection vs. Ear Mites: Vet Reviewed Differences (With Pictures)

If your cat is constantly shaking their head and scratching their ears, a few scenarios may come to mind: Are they allergic to something? Are they sick? Have they been infested by parasites? Constant irritation is also a fairly common...

Cat Yeast Infection vs. Ear Mites

10 Best Flea Drops for Cats in 2025 – Reviews & Top Picks

Providing solid flea protection for cats is vital. Flea bites cause itching and make cats scratch and bite themselves, which can lead to skin infections. These tiny parasites can transmit disease-causing bacteria and tapeworms to cats. Fleas are so problematic...

Woman injecting cat product to prevent from flea treament

Can Cats Eat Tuna? Vet-Reviewed Nutrition Facts & FAQ

Tuna is one of the human foods most offered to cats, either as a treat or part of their daily diet. However, just because your cat loves tuna doesn’t mean it’s healthy or safe for them. Cats shouldn’t eat tuna...

Can Cats Eat Tuna

Why Won’t My Senior Cat Eat? 6 Vet-Reviewed Ways to Help

If your cat reaches their golden years, their appetite can decrease. This can happen for a few reasons, but cats will need intervention and care from their owners to feel well again. If your old cat is not eating their...

old-ginger-house-cat-is-resting-on-the-couch_shymar27_shutterstock