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(407) 862-6892

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Providing Veterinary care for Altamonte Springs, Longwood, Maitland, and the Greater Orlando Area.

Veterinary Services, Heartworm Prevention


Heartworms are extremely dangerous parasitic worms that can easily infect dogs and cats. Heartworms are transmitted by mosquitoes. When an infected mosquito bites an animal, it transmits tiny heartworm larvae into the animals bloodstream. The larvae enter the new host and make their way under the skin. The larvae quickly grow into adult heartworms and invade the heart and lungs of the host. Heartworm disease is deadly if it is left untreated.

Florida has an ideal climate for mosquitoes and our pets are constantly at risk. According to the Companion Animal Parasite Council (CAPC), 1 in 85 American dogs tested positive for heartworm disease. 1 in 72 dogs tested positive in Florida, 1 in 68 tested positive in Seminole County.

How to Prevent Heartworms

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All pets are at risk of contracting heartworm disease. Due to the rampant mosquito population, heartworm prevention is particularly important in Florida and other southern states. Heartworm prevention should typically start around 6 to 8 weeks of age and be given to the pet monthly for the rest of their lives. Heartworm preventive medicine is safe, easy and inexpensive, especially when compared to treatment.

We offer a variety of preventatives for you to choose from, so that you can find one that best suits you and your pet. All of our preventatives are extremely effective and will provide you with a peace of mind. Elanco's Trifexis is 100% guaranteed by Elanco when purchased through your veterinarian. If your pet develops heartworms while appropriately taking Trifexis, Elanco will pay for the entire heartworm treatment.

Outdoor cats and dogs are not the only ones at risk for heartworm disease. Reportedly, 30% of cats diagnosed with heartworm disease are considered indoor only cats by their parents. There is currently no approved treatment for heartworm disease in cats, so prevention is critical.

Our Three Most Recommended Heartworm Preventatives

  • Trifexis (also controls fleas, hookworms, roundworms, and whipworms) - DOGS
  • Iverhart (also controls hookworms and roundworms) - DOGS
  • Revolution (also controls hookworms, roundworms, fleas, and ear mites)- CATS

During your pet's next Preventive Care Exam, ask our veterinarian to run a quick blood test to ensure that your pet is heartworm negative. Then we will provide you with the prescription medication of your choice. FDA regulations require a new heartworm test once per year.

Heartworm Disease Symptoms

  • Dysfunction of the lungs, heart, liver and kidneys
  • Coughing
  • Exercise intolerance
  • Dyspnea (difficulty breathing)
  • Abnormal lung sounds
  • Syncope (temporary loss of consciousness due to lack of blood flow to the brain)
  • Abnormal heart sounds
  • Eventually death

Heartworm Treatment (For Heartworm Positive Cases)

It is possible to cure a dog with heartworms, but there are no known cures for heartworm positive cats. Treatment for dogs requires multiple injections of immiticide into the back muscles. Immiticide is FDA approved and considered safe, but it is very expensive. Due to the nature of the treatment process, it can take months for an infected do to recover. Treatment of heartworm disease requires hospitalization and long periods of inactivity. While there are many success stories, the procedure can cause a lot of stress on your dog.

Why Buy Heartworm Preventatives from Westmonte Animal Clinic?

Our veterinarian routinely runs heartworm tests and sells heartworm preventatives such as Trifexis and Iverhart. It has never been easier to buy flea, tick, and heartworm prevention products. Due to multi-million dollar advertising campaigns by online pet pharmacies, many believe they are the pest place to buy the medication. However, Elanco and Merck offer some amazing guaranties on their products when the products are purchased through your veterinarian. They will not guarantee any product purchased through a third party supplier.

Call today to get your pet tested and started on a Heartworm Prevention Program. (407) 862-6892

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Contact Information

  • Westmonte Animal Clinic
  • 230 S. Wymore Road
  • Altamonte Springs, FL 32714
  • (407) 862-6892

After Hours Emergencies

  • Veterinary Emergency Clinic of Casselberry
  • 195 Concord Drive
  • Casselberry, FL 32707
  • (407) 644-4449