Understanding Heartworms: Prevention, Symptoms, and Treatment

At Animal Medical Center of Bel Air in Bel Air MD, we take heartworms seriously—and so should every pet parent. Spread by mosquitoes and often silent in the early stages, heartworms can cause severe—and possibly fatal—heart and lung problems in both dogs and cats. The good news? It’s completely preventable. Let’s walk through the signs of heartworm in dogs and cats, your prevention options, and how we treat it if it strikes.

 What Is Heartworm Disease?

Heartworm disease is caused by parasitic worms that live in the heart, lungs, and blood vessels of affected pets. It’s transmitted through the bite of an infected mosquito.

 Why it’s so dangerous:

• Worms can grow up to 12 inches long
  
• Dogs can host dozens to hundreds of worms
  
• Cats may have only a few, but even one worm can cause severe damage.
  

 Signs of Heartworm in Dogs and Cats

Many pets show no symptoms early on, which is why annual testing is critical. As the disease progresses, signs become more noticeable.

 In Dogs:

• Persistent cough
  
• Fatigue after mild activity
  
• Decreased appetite
  
• Weight loss
  
• Swollen belly (fluid buildup)
  

 In Cats:

• Coughing or asthma-like attacks
  
• Vomiting
  
• Loss of appetite
  
• Lethargy
  
• Collapse or sudden death (in extreme cases)
  

Fun Fact: Cats are not natural hosts for heartworms, but even a few worms can be life-threatening.

 Heartworm Prevention Medication for Pets

Prevention is easy, safe, and cost-effective. At our veterinary clinic in Bel Air MD, we recommend year-round protection:

• Monthly oral or topical preventives
  
• Injectable preventives that last up to 6 or 12 months (dogs only)
  
• Annual heartworm testing
  

Missed a dose? Call us immediately. A gap in prevention could leave your pet vulnerable.

 Heartworm Treatment Options

 For Dogs:

• Blood tests and x-rays to confirm infection
  
• Injections to kill adult worms (requires multiple visits)
  
• Strict exercise restriction during treatment
  
• Medications for inflammation and secondary infections

Severe cases may require surgery, which can be quite costly and is not fun for Fido. Your dog may also need to be kenneled for long periods.

 For Cats:

There’s no approved drug treatment for heartworm in cats. Instead, we:

• Manage symptoms
  
• Use steroids to reduce inflammation
  
• Monitor regularly
  

Note: Prevention is especially important for cats because treatment is not an option.

FAQs About Heartworm Disease

Is heartworm only a concern in warm months?

No. Mosquitoes can survive indoors and in milder climates year-round. Year-round prevention is safest.

Can indoor pets get heartworm?

Yes. All it takes is one mosquito bite. Your pet can get infested even in their bed! 

Is testing really necessary every year?

Yes. Even with regular prevention, annual testing ensures early detection in case of a missed dose.

Heartworm Help in Bel Air MD

Are you looking for a great veterinary clinic in Bel Air MD? You can try searching for a vet near me, or just call us at Animal Medical Center of Bel Air. 

At Animal Medical Center of Bel Air in Bel Air MD, we’re dedicated to protecting your pets from preventable threats like heartworm disease. Schedule your annual test or refill your pet’s heartworm prevention today.

This blog is meant to be informational only. Always consult with your veterinarian for the right medical advice, diagnosis, or treatment plan for your pet and follow their advice.