Flea and Heartworm Preventative

Flea, Tick and Heartworm Preventative

Please Note

Heartworm disease may be transmitted to your dog when they are bitten by an infected mosquito. Due to our warm climate in Florida, mosquitoes are active all year long. Dogs must receive a heartworm protection medication every 30 days protect them from possibly contracting heartworms.

Heartworm preventatives are not meant to cure a dog who is heartworm infected. Putting them on a preventative while they are heartworm positive may make them seriously ill. Heartworm protection medications require a veterinarian to prescribe.

Heartworm testing is available here Tuesday - Friday from 10:00am to 4:00pm by appointment.

The test is $20.00.

Humane Society of St. Lucie County is happy to provide you with heartworm preventative at affordable prices. In order for us to provide you with a preventive, you must be able to show that your pet has been tested within the last 6 months and through the Huamane Society of St. Lucie County. We can only provide enough medication to last until the next test is due.


Heartgard Chewables are a flavored treatment for dogs given once a month to prevent heartworms.


  • Highly effective in preventing heartworms
  • A convenient and tasty chewable for easy administration
  • Delicious beef flavor that most dogs will eat

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Tri-heart Plus

Tri-heart Plus is the generic alternative to Heartgard Plus. It works just as effectively, killing immature heartworm and intestinal worms including hookworms and roundworms. This medication features the same active ingredients as brand name heartworm drugs: Ivermectin and Pyrantel pamoate.


  • Combines preventive heartworm medicine with an intestinal de-wormer
  • Effectively kills the immature form of heartworm
  • Treats and prevents roundworms and hookworms
  • Tasty chewable tablet makes for easy monthly dosing

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Activyl is a monthly soft, beef flavored chew that kills both fleas and ticks. It contains an ingredient, afoxolaner, that helps treat and control fleas and ticks and keeps killing for a full 30 days. So it helps provide protection you can feel good about. NexGard is for use in dogs only.


  • First-ever flea and tick preventative from the makers of Frontline that comes in a tasty beef-flavored chew
  • No more messy topical preventatives, and no more worrying about washing off your dog's flea protection
  • Safe, effective, FDA-approved, and lasts for 30 days
  • Can be taken alongside heartworm medication

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Sponsor Spotlight

Hannan Environmental Services

The Humane Society of St. Lucie County with the Florida Animal Friend Grant of $25,000 was able to perform 800 spay and neuter procedures for a low cost to pet owners in St. Lucie County.

The grant allowed pet owners to make sure their pets are able to live long healthy lives at an affordable cost to them. Thanks to Florida Animal Friend for your continued effort in helping reduce the amount of unwanted pets in Florida.


Call 772.461.0687 to make an appointment for our low cost clinic.