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 in Cats (Vet Reviewed Signs & Care FAQs)

Sick cat in animal hospital

Heartworms in cats are similar to those in dogs. However, they are difficult, if not impossible, to treat, and the best way to keep your cat healthy is to work with your vet to prevent them. Because heartworms can harm or kill your cat, getting immediate veterinary care can help alleviate the signs.

Your vet can also monitor them to see if they rid themselves of heartworms on their own. So, what signs of heartworms in cats should you be looking for? Keep reading to find out.

divider 3 paws

The 4 Possible Signs of Heartworm in Cats

1. Respiratory Problems

Heartworms don’t stay in the heart. They travel throughout the vascular system, and the first place they often end up is in the lungs, where they can restrict blood flow and cause inflammation.

You may notice intermittent coughing or signs that your cat has trouble breathing, like breathing with their mouth open. These signs are not unique to heartworms and should always be evaluated by your veterinarian for a proper diagnosis, but if heartworms are causing them, they must be addressed early.

When respiratory issues develop from heartworms, it’s called  Heartworm-Associated Respiratory Disease or HARD.1 While it can be challenging to treat heartworms in cats, your vet may be able to address the respiratory problems, making it easier for them to breathe.

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. Lethargy

tired sick cat lying on bed
Image By: Natata, Shutterstock

If your cat seems tired and uninterested in their toys or other activities, it’s a sign that they should see the vet. Lethargy, like respiratory problems, is not a definite sign of heartworms in cats but can indicate that something is wrong and should be diagnosed and treated.

In combination with other signs on this list, it could mean that your cat has contracted heartworms, in which case your veterinarian is the best resource for advice and treatment. You know your cat best, so trust your instincts if they aren’t acting like themselves.


3. Weight Loss

Heartworms in cats can cause general unwellness that can lead to weight loss. Coughing associated with the disease can also precipitate vomiting. You should take these concerns to your vet, who can determine the underlying cause and suggest appropriate treatment.


4. Death

Death due to heartworms can come years after a diagnosis, while your cat has been living a somewhat normal life before succumbing to it. It can also come on suddenly, without knowing your cat even had them. In that case, the only way to know that heartworms are to blame is for your vet to perform a post-mortem exam to determine the cause of an unexpected death.

Because the sudden death of a pet is shocking and heartbreaking, knowing what happened can provide closure and peace of mind, which is why some pet parents choose this option. It may also help prevent other pets in the home from getting sick.

divider 3 paws

FAQs About Heartworms in Cats

How Are Heartworms in Cats Diagnosed?

Many of the signs above can also indicate other cat diseases. Therefore, it is crucial to pinpoint the exact cause so it can be treated in the best possible way and improve your cat’s quality of life. There are several ways to diagnose heartworms in cats.

If your vet suspects heartworms, they will likely run blood tests for heartworm antigens. X-rays and a cardiac ultrasound may also show the presence of heartworms.

You are free to use this image but we do require you to link back to Catster.com for credit

Can Heartworms Be Treated?

The medications used for dogs cannot be used for cats, and there is no effective treatment to cure heartworms in cats. Some cats may rid themselves of heartworms on their own after a few years, and your vet will recommend testing every 6 to 12 months or more often if they display concerning signs.

While there isn’t a way to permanently cure heartworms in cats, your vet can treat the side effects to make your cat more comfortable.

Can They Be Prevented?

Even indoor cats are susceptible to heartworms, but if mosquitos are prevalent in your area or your cat is frequently outside, you must work with your vet to prevent heartworms. A monthly treatment can be a topical medication or pill, but it should be given on a strict schedule to ensure your pet is protected.

You’ll need a prescription from your vet to purchase heartworm prevention medications, or you can buy them directly from their clinic in most cases.

divider 3 paws

Conclusion

Heartworms in cats can be serious, and if you see your cat behaving strangely or showing signs of distress, get them to a vet immediately. If they determine that heartworms are the cause, you can work closely with them to ensure your cat remains as healthy as possible with the hope that they can clear the worms on their own. If not, remain vigilant in watching for signs of their condition worsening so you take them to the vet promptly.

See Also:


Featured Image Credit: Kachalkina Veronika, Shutterstock

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

National Heartworm Awareness Month – How and When Is It Celebrated?

National Heartworm Awareness Month is an opportunity to learn more about this preventable disease and what you can do to protect your furry...

dog and cat checked by vet

What If I Miss a Month of My Cat’s Heartworm Medication? Our Vet Explains the Risks

Heartworm disease is found in every state in the U.S., and while it can be serious, it’s also preventable through monthly or once-a-year...

vet checking up a cat

Hypertrophic Cardiomyopathy in Cats (HCM): Signs, Diagnosis & Treatment (Vet Answer)

Hypertrophic cardiomyopathy (HCM) is the most common type of heart condition witnessed in cats. When hypertrophic cardiomyopathy occurs, the muscle of the heart...

sad sick cat in bed

Lymphoma in Cats: Causes, Signs & Care (Vet Answer)

Lymphoma, or lymphosarcoma, is the most common cancer affecting cats. It is a malignant type of cancer affecting the lymphatic system, a network...

vet checking up the cat

More related

cream point himalayan persian cat

Brachycephalic Airway Syndrome in Cats: Signs, Causes, & Care (Vet Answer)

You may not know what a brachycephalic cat is, but chances are you have seen one. Brachycephalic refers to the “squished face” breeds,...

vial of blood tested for salmonella

Salmonella in Cats: Causes, Signs & Prevention (Vet Answer)

Salmonella is a major public health concern because it can affect most animals and humans. Salmonellosis is the infection caused by Salmonella bacteria....

Hispanic woman working in modern vet clinic talking to bengal cats owner

Parkinson’s in Cats (Wolff-Parkinson-White Syndrome): Our Vet Explains Prevention, Signs & Treatment

If you’re familiar with Parkinson’s disease in humans, you might have asked yourself if cats can get Parkinson’s. There is a rare condition...

Cat sneezes

Cat Wheezing: Our Vet Explains What It Is, Why It Happens & When to See a Vet

You’ve slowly been noticing that your cat’s breathing has changed. It seems more like a wheeze, but you’re unsure if you should be...

Keep reading

Do Cats Get Brain Freeze? Vet-Reviewed Facts & FAQ

If you’ve ever sucked down a milkshake too quickly, you’re probably familiar with the discomfort of “brain freeze.” A quick Internet search will reveal multiple clips of cats reacting abruptly to their first taste of ice cream or frozen treats....

bored domestic cat

Is Incense Safe for Cats? What You Should Know!

Incense can improve focus and relaxation while reducing tension, anxiety, and insomnia. It is often used in meditation and yoga, but what effect does it have on our cats? Is it even safe for them? Unfortunately, incense is not safe...

Catster_Is Incense Safe for Cats

Why Does My Cat Pee on the Floor? 7 Vet-Reviewed Reasons & Care Tips

While it is annoying to have your cat pee on the floor in your house, it is not entirely unheard of. Many things can cause a cat to do this, and identifying the cause of this behavior is necessary in...

cat looking a pee on the floor

Why Does My Cat Meow When I Sneeze? 4 Vet-Approved Reasons

If you’ve ever sneezed around a cat, you probably noticed their strange response. Some hiss, while others run away whenever they hear their owner sneeze. More commonly, cats meow whenever their owners sneeze, especially if the cat is comfortable around...

agressive cat meowing

How to Tell If a Cat Is Going Into Labor: 6 Vet-Approved Signs to Look For

If your cat is expecting kittens, it can be an exciting time waiting for those adorable little bundles of fluff to arrive. You’ll want to make sure you have everything ready, so you should start watching for early signs of...

pregnant cat lying on the table

Can Cats Eat Sunflower Seeds? Vet-Verified Nutrition Facts & Considerations

Sunflower seeds are the edible gifts of the sunflower. Not only are they tasty, but they are nutritious and considered to be one of the healthiest snacks around. But can your beloved feline eat them, too? The quick answer is...

Can Cats Eat Sunflower Seeds

Why Do Kittens Sometimes Die Suddenly? Vet-Verified Causes & Facts

Having a litter of newborn kittens in your house can be a cause for celebration, but it can sometimes also cause heartache. These tiny little bundles of fluff are incredibly fragile, and sometimes you might wake up to find that...

newborn kitten in man's hand

Can Cats Get Pink Eye? Vet Reviewed Facts & FAQ

A common eye condition cats can develop is conjunctivitis, more commonly known as pink eye. Every cat owner should know about the signs of pink eye and when to contact their vet. Although humans can contract conjunctivitis, they rarely catch...