At Cicero Animal Clinic, we believe prevention and early education are key to keeping pets healthy. But we also know how stressful it can be to learn your dog or cat has tested positive for heartworm. Since April is National Heartworm Awareness Month, we’re breaking down exactly what happens after a heartworm diagnosis—and how we support your pet every step of the way.

A Positive Test is Just the Beginning

When your pet tests positive for heartworm, your veterinarian won’t begin treatment immediately. First, we’ll perform a series of diagnostic tests to fully understand your pet’s condition. These tests may include:

• A microfilaria test to check for immature heartworms in the bloodstream
• Comprehensive bloodwork to evaluate organ health
• Imaging such as X-rays or ultrasound to assess the heart and lungs

These results help determine how advanced the infection is and allow us to customize a treatment plan that is safe and effective for your pet.

Why Rest is Essential During Heartworm Treatment

Once heartworm disease is confirmed, your pet will need to rest—a lot. That’s because physical activity increases the risk of serious complications as the heartworms begin to die and break down inside the body.

• Dogs are often placed on restricted activity or crate rest for several weeks to months
• Cats should be kept calm and stress-free during and after treatment
• Any increased heart rate or exertion can raise the risk of lung damage or embolisms

While the idea of limiting your pet’s movement may be tough, it’s one of the most important things you can do to support their recovery.

Treating Heartworm in Dogs

Heartworm treatment for dogs typically follows a structured approach:

• Pre-treatment medications such as antibiotics may be prescribed
• Anti-inflammatories help control inflammation caused by dying worms
• A series of injections will be given to kill the adult heartworms
• Preventative medications may also be used to target juvenile worms and prevent further infection

Throughout treatment, dogs are monitored closely for side effects and complications. Once treatment is complete, ongoing heartworm prevention is required for life, as dogs do not develop immunity from a past infection.

Cats Require a Different Approach

Cats are more vulnerable to heartworm-related complications, and unfortunately, there is no approved drug therapy to eliminate adult heartworms in felines. Instead, treatment focuses on managing symptoms and supporting overall health. Your cat’s care plan may include:

• Medications to control inflammation in the lungs
• Close monitoring for breathing difficulties or sudden changes
• Supportive therapies to manage discomfort and improve quality of life

Because there is no cure for heartworm disease in cats, consistent prevention is the best—and only—defense.

Prevention is the Best Protection

Heartworm disease can be life-threatening, but it’s also preventable. At Cicero Animal Clinic, we recommend annual heartworm testing and monthly preventatives for all dogs and cats, even those that live mostly indoors. Mosquitoes, the carriers of heartworm, only need a tiny opening to enter your home.

If your pet isn’t on a heartworm preventative or is due for testing, now is the time to act. Call Cicero Animal Clinic today to schedule an appointment and keep your furry family members safe all year long.