Heartworm Prevention in Georgia: Why Year RoundProtection Matters

​Introduction

Heartworm disease is one of the most serious and potentially life-threatening conditions affecting dogs
and cats in the southeastern United States. Because Georgia has a warm climate and a long mosquito
season, pets in our region are at particularly high risk. Many pet owners believe heartworms are only a
summer problem, but mosquitoes can remain active for much of the year, allowing the disease to
spread even during cooler months.

Heartworm disease is caused by parasitic worms that live in the heart, lungs, and surrounding blood
vessels of infected animals. These worms can grow up to a foot long and cause severe damage to the
cardiovascular and respiratory systems. The good news is that heartworm disease is almost entirely
preventable with consistent veterinary care and monthly prevention.

Understanding how heartworms are transmitted, what symptoms to watch for, and why year round
prevention is essential can help keep your pets healthy and protected.

What Are Heartworms and How Are They Transmitted?

Heartworms are parasitic worms scientifically known as Dirofilaria immitis. They are spread through the
bite of an infected mosquito. When a mosquito bites an infected animal, it picks up microscopic
heartworm larvae circulating in the bloodstream. These larvae develop inside the mosquito and are
then transmitted to the next animal the mosquito bites.

Once inside a new host, the larvae migrate through the tissues and bloodstream over several months.
Eventually, they mature into adult worms that settle in the heart, lungs, and pulmonary arteries. Adult
heartworms reproduce and release microscopic offspring into the bloodstream, continuing the cycle.

Because mosquitoes are common in Georgia, especially in warm and humid environments, pets that
spend time outdoors—or even indoors—can be exposed.

Why the Southeast Has a Higher Risk
The southeastern United States consistently reports some of the highest rates of heartworm disease in
the country. Warm temperatures, humidity, and abundant mosquito populations create ideal conditions
for heartworm transmission.

Even pets that live primarily indoors are not completely safe. Mosquitoes can easily enter homes
through doors, windows, and garages. Additionally, many pet owners travel with their pets, visit parks,
or spend time outdoors during spring and summer, increasing exposure risk.

Veterinarians in Georgia strongly recommend year round heartworm prevention because our climate
allows mosquitoes to remain active for extended periods of time.

Symptoms of Heartworm Disease in Dogs

Heartworm disease can progress silently for months or even years before obvious symptoms appear.
Early infections may not show noticeable signs, which is why routine testing is so important.

As the disease progresses, dogs may develop:
• Persistent coughing
• Fatigue after moderate activity
• Decreased appetite
• Weight loss
• Difficulty breathing
• Swollen abdomen due to fluid accumulation

In advanced cases, heartworm disease can lead to heart failure and severe lung disease. Without
treatment, the condition can become fatal.

Heartworms in Cats

While heartworm disease is more common in dogs, cats can also become infected. Even a small
number of worms can cause serious illness in cats.

Symptoms in cats may include:
• Coughing or asthma like breathing
• Vomiting
• Loss of appetite
• Lethargy
• Sudden collapse

Because heartworm infections in cats are harder to diagnose and treat, prevention is particularly
important.

Why Prevention Is Better Than Treatment

Treating heartworm disease is significantly more complicated, expensive, and risky than preventing it.
Treatment for infected dogs requires multiple injections, strict exercise restriction, and careful
monitoring by a veterinarian.

Even after successful treatment, some pets may experience permanent damage to the heart or lungs.
Preventive medications, on the other hand, are safe, effective, and easy to administer. Most heartworm
preventives are given once a month or as an extended release injection administered by a
veterinarian.

Preventing heartworms protects your pet from serious illness and saves pet owners from the emotional
and financial stress of treatment.

Types of Heartworm Prevention

There are several types of heartworm prevention available for pets. Your veterinarian can help
determine which option is best based on your pet’s age, health, and lifestyle.

Common forms of prevention include:
• Monthly oral chewable tablets
• Monthly topical medications applied to the skin
• Long acting injectable preventives administered by a veterinarian

Many heartworm preventives also protect against other parasites such as intestinal worms, fleas, and
mites.

Why Annual Heartworm Testing Is Necessary
Even pets on regular prevention should be tested for heartworms once a year. Annual testing ensures
that prevention is working and that no infection has occurred.

If a pet misses doses or receives medication late, there is a possibility that heartworm larvae could
develop into adult worms. Early detection allows veterinarians to intervene before severe damage
occurs.

Testing typically involves a simple blood test performed during your pet’s annual wellness visit.

What to Do If You Miss a Dose

Missing a dose of heartworm prevention occasionally happens. If this occurs, contact your veterinarian
for guidance. In many cases, restarting prevention promptly can help reduce risk, but your veterinarian
may recommend testing depending on how much time has passed.

Consistent dosing is the best way to ensure your pet remains protected.

Conclusion

Heartworm disease is a serious but preventable condition that affects thousands of pets each year. In
Georgia’s mosquito friendly climate, year round prevention is the safest way to protect your dog or
cat from this dangerous parasite.
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Regular veterinary exams, annual heartworm testing, and consistent preventive medication work
together to keep pets safe. If you have questions about heartworm prevention or would like to discuss
the best options for your pet, contact your veterinary team. Preventive care today can protect your pet’s
health for years to come.