What is Heartworm Disease in Cats?

Heartworm disease in cats is caused by a parasitic worm called Dirofilaria immitis, transmitted through mosquito bites. Unlike in dogs, heartworms in cats don’t always reach adulthood, but even immature worms can cause serious health issues.

Cats are not the preferred host for heartworms, which means the infection behaves differently in felines. Unfortunately, this also makes diagnosing and managing the disease more challenging.

Symptoms of Heartworm Infection in Cats

Heartworm symptoms in cats can be subtle or sudden, making early detection tricky. Some of the most common signs include:

• Coughing or wheezing
• Difficulty breathing
• Vomiting unrelated to eating
• Loss of appetite or weight loss
• Lethargy or reluctance to play

In severe cases, a condition called Heartworm Associated Respiratory Disease (HARD) can develop. This mimics asthma or bronchitis and can cause significant lung damage. Sudden collapse or death can also occur in cats with undiagnosed infections, though this is rare.

If you notice any of these symptoms, seek veterinary care immediately.

How Do Cats Get Heartworm?

The process begins with a mosquito bite. When a mosquito bites an infected animal, it picks up microscopic larvae (microfilariae). When that mosquito bites your cat, it transfers the larvae into their bloodstream.

Once inside, the larvae travel to the heart and lungs. While cats typically harbor fewer worms than dogs, even a single worm can cause significant health problems due to their smaller heart and lungs.

Diagnosing Heartworm Disease in Cats

Diagnosing heartworm in cats isn’t straightforward. Unlike dogs, blood tests for cats may not always provide definitive results. Veterinarians often rely on a combination of diagnostics, including:

• Antigen tests to detect adult heartworms
• Antibody tests to confirm exposure
• X-rays or ultrasounds to check for heart or lung abnormalities

At North Oatlands Animal Hospital, we use advanced diagnostic tools to provide accurate and timely results for your pet’s health.

Treatment for Heartworm in Cats

Unfortunately, there’s no approved treatment to eliminate adult heartworms in cats. Instead, care focuses on managing symptoms and minimizing damage. Your vet might recommend:

• Anti-inflammatory medications to reduce lung inflammation
• Heartworm preventatives to stop new infections
• Supportive care, such as oxygen therapy, for severe cases

In rare instances, surgical removal of heartworms may be necessary.

The best approach? Preventing heartworm infection in the first place.

Preventing Heartworm Infection in Cats

Prevention is the key to protecting your cat from heartworm. Monthly preventatives, like topical or oral medications, are highly effective in stopping larvae from developing into adult worms.

Even indoor cats need protection, as mosquitoes can find their way inside. Talk to your veterinarian about the best preventative for your feline friend.

Why Prevention Matters

Heartworm prevention is not just easier than treatment—it’s safer and more affordable. Since there’s no cure for adult heartworms in cats, prevention is your best defense against this potentially fatal disease.

At North Oatlands Animal Hospital and Reproductive Center, we prioritize your pet’s health and are here to guide you through heartworm prevention options.

Protect your feline friend from heartworm disease today. Schedule a visit with North Oatlands Animal Hospital and Reproductive Center to discuss prevention and ensure your cat stays safe, healthy, and happy. Visit 19275 James Monroe Highway,Leesburg, VA 20175 or call (703) 777-7781 to book an appointment now!