Heartworm Disease in Pets: What You Need to Know

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Heartworm disease is a serious and potentially life-threatening condition in pets, but with early detection and expert treatment, it can be managed effectively. At Eeden Animal Hospital in San Clemente, Dr. Kerolos and our dedicated veterinary team are here to guide you through diagnosis, treatment, and long-term prevention with compassion and care.

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What Are Heartworms?

Heartworms are parasitic roundworms spread through mosquito bites, making pets in warm, coastal areas like San Clemente especially vulnerable. Once infected, the parasites can grow up to a foot long and live in the heart, lungs, and blood vessels—causing permanent damage if left untreated.

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While dogs are the primary hosts, cats can also be affected, although their symptoms and treatment differ.

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Signs of Heartworm Infection

Some pets show no signs at all in the early stages, while others may exhibit:

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• Persistent coughing

• Fatigue or reluctance to exercise

• Difficulty breathing

• Loss of appetite

• Weight loss

• Swollen abdomen (from fluid buildup)​

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If your pet is showing any of these symptoms, a heartworm test is strongly recommended.

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Heartworm Treatment for Dogs & Cats

If your pet tests positive for heartworms, Dr. Kerolos will develop a personalized treatment plan based on the stage of the infection and your pet’s overall health.

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Standard Treatment Protocol Includes:

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• Doxycycline & Prednisone: Oral medications to reduce inflammation and prepare the body for treatment

• Melarsomine Injections: To kill adult heartworms—typically administered in-office over several months

• Activity Restriction: Critical to reduce the risk of complications such as clots or embolism

• Supportive Care: Hospitalization may be necessary depending on severity

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For cats, treatment may be supportive rather than curative, focusing on symptom management and preventing future exposure.

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Caring for a Pet with Heartworms at Home

After treatment has begun:

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• Keep your pet calm and inactive – even if they seem to feel better

• Follow medication schedules exactly as prescribed by Dr. Kerolos

• Monitor for signs of distress such as coughing, lethargy, or sudden weakness, and contact us immediately if you’re concerned​

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In multi-pet households, preventive care is vital to protect healthy pets from exposure.

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Preventing Heartworm is Easier Than Treating It

Prevention is the best medicine. Monthly heartworm preventives (oral or topical) are safe, affordable, and effective. Year-round protection is strongly recommended—especially in Southern California.​