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Heartworm Testing

Heartworm prevention and testing are critical to your pet's health. Our vets at Marcello Veterinary Hospital, can help you protect your pet with effective preventive medication and annual testing. 

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Prevention & Early Detection

At Marcello Veterinary Hospital, we recommend annual testing for heartworms and a lifelong preventive treatment program for companion pets. Testing for the presence of heartworms is quick, easy, and economical, and preventive treatment is much more cost effective than medical care for an infected animal.

Heartworm disease is a life-threatening condition that can affect outdoor and indoor pets. Spread by mosquitoes, heartworm larvae are transmitted to healthy animals by mosquitoes that have bitten infected animals.

This disease can result in heart failure, severe lung disease, damage to other organs, and death. Preventive treatment and annual testing at Marcello Veterinary Hospital are key to keeping your pet healthy and heartworm-free.

Heartworm Testing for Cats and Dogs, Louisiana Veterinarians

Heartworm Prevention, Testing & Treatment

Lifelong prevention, testing and treatment play a critical role in protecting your dog's health against heartworms and complications due to disease. Talk to our vets at either of our two locations in Houma or Raceland for advice and guidance on parasite prevention.

Preventing Heartworm in Your Pet

Steps for Dogs

Preventing, testing and treating heartworms in dogs can help keep your pet healthy and free of these parasites.

  • Prevention

    Preventive medications come in several forms, including topical applications, 6-month injectables, and once-a-month oral treatments.

  • Testing

    Dogs six months and older are required to be tested for heartworms before starting them on any regular heartworm prevention. We check for the presence of heartworm infection by collecting a small blood sample from your pet and using a SNAP test.

    If your dog’s test results come back negative, our veterinarians will start him or her on a preventive treatment that you will need to administer year-round for the rest of the animal’s life. 

    A heartworm test should be scheduled annually to ensure your pet remains heartworm free. Any gap in coverage may require another heartworm test prior to restarting on a preventative.

  • Treatment

    If your dog's test results come back positive, then we will offer treatment to potentially clear your dog of heartworm disease, however, it is a lengthy and costly process.

    Your pet will need to be kept calm for 30 days in order to avoid putting stress on the heart and lungs.

Steps for Cats 

Heartworm prevention is key to keeping cats in good overall health and free of complications due to disease. 

  • Prevention

    Cats should be put on a preventive treatment and tested as recommended by our veterinarians. Cats are not a natural host for heartworms.

    However, just a few can make a cat very ill. Prevention in cats is critical because there is no approved drug treatment for heartworm infection in cats. 

  • Testing

    When your cat receives a Feline Leukemia Virus/Feline Immunodeficiency Virus/Heartworm antigen combination test, he or she will be tested for heartworms.

  • Treatment

    If your cat tests positive for heartworms, he or she can be helped with good veterinary care and a long-term management plan.

FAQs About Heartworm Disease

Heartworm prevention, testing and treatment can bring up many questions and concerns for pet owners. Here are answers to some of the most common question our vets receive.

  • What are heartworms?

    Mosquitoes pick up larval heartworms (microfilaria) and transmit this potentially deadly parasite. Heartworms circulate in the bloodstream of infected animals, causing disease and potentially life-threatening complications. 

    The heartworm in dogs that's prevalent in the United States is known as Dirofilaria immitis. Dogs, coyotes, wolves and foxes are considered to be primary heartworm hosts, but other mammals including cats and ferrets can be infected. 

  • What are some symptoms of heartworms in cats and dogs?

    Symptoms of heartworms in dogs and cats may differ. Dogs may show few or no symptoms in the early stages of disease. 

    Signs of heartworm disease in dogs can include

    • Mild but persistent cough
    • Fatigue after moderate activity
    • Decreased appetite 
    • Reluctance to exercise
    • Weight loss 

    Signs of heartworm disease in cats can be very subtle or pronounced and may include:

    • Asthma-like attacks
    • Lack of appetite 
    • Periodic vomiting
    • Weight loss
    • Coughing
  • How can heartworm disease affect my pet's health?

    In addition to the symptoms mentioned in the question above, your pet may experience complications as heartworm disease progresses. 

    Pets may develop:

    • Heart failure 
    • Fainting
    • Seizures
    • Lung disease
    • Appearance of a swollen belly due to excess fluid in the abdomen 
    • Sudden blockages of blood flow leading to life-threatening cardiovascular collapse (in dogs)

    Sadly, sometimes the first sign of heartworm disease is sudden collapse or sudden death. 

    This can be avoided, simply and cost-efficiently through annual testing and preventative treatments that we provide at Marcello Veterinary Hospital.

  • Why is heartworm prevention and testing important to my pet's health?

    Prevention is the best tool we have in protecting your pet's health against heartworms and heartworm disease, and it is much more cost-effective (and less stressful) than bringing your pet in for medical care after an infection has developed. 

    Annual heartworm testing is also a critical aspect of your pet's healthcare and will help them to stay healthy and heartworm-free, not to mention offer you peace of mind. 

  • Why should my pet be tested for heartworms before I administer preventive medication?

    Testing for heartworm disease is designed to detect the condition in an animal before outward symptoms are identified.

    The purpose of heartworm testing is to detect pre-clinical infections. In addition, giving a pet with high numbers of heartworm larvae in their bloodstream preventative medications can be dangerous as killing off large numbers of larvae can cause allergic-like reactions in some pets. 

    While monthly preventatives are safe, they do not kill adult heartworms. Pets with heartworms will need further diagnostics and monitoring. 

  • When should I start heartworm prevention for my pet?

    We recommend starting puppies and kittens on heartworm prevention no later than eight weeks of age.

  • How often should my cat or dog be tested for heartworms?

    Dogs should typically be tested for heartworms annually. This can be done during a routine visit. 

    Cats should be tested before being put on prevention and re-tested as your veterinarian advises. 

    Your cat or dog may need to be tested depending on whether they've previously had preventive medication, their age, whether preventative medication doses were missed, etc. Ask your veterinarian for their guidance.

  • Can heartworm tests return inaccurate results?

    It's rare for heartworm tests to return either false positive or false negative results. 

    False positive test results happen when an animal has tested positive but does not have adult heartworms in his or her body at the time of testing. Your veterinarian will likely retest your pet or perform a different test if a single test reveals a positive result.

    False negative test results occur when a dog or cat is infected with adult heartworms and the test fails to detect their presence. This could be due to early infestations, very low numbers of parasites and infestation with mostly male worms. 

Schedule Your Pet's Heartworm Test

Because south Louisiana is a perfect breeding ground for mosquitoes, pet owners need to protect their pets year round with preventive heartworm treatment and annual testing. Schedule a heartworm test today if you are in the nearby areas of Houma, Thibodaux, Morgan City, Raceland, or Mathews.

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Marcello Veterinary Hospital is accepting new patients! Our experienced vets are passionate about the health of Louisiana companion animals. Get in touch today to book your pet's first appointment.

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