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*20% off your first Pharmacy order with code RX20 Terms
20% off promotion is valid only on your first Chewy Pharmacy order. This exclusive offer is only valid for the intended recipient of this email. Must be logged in to your account to receive offer. Maximum discount of $30. Must enter code RX20 at checkout. Limit one promotion code per household. Not valid on Activyl, Bravecto, Incurin, Mometamax, Optimmune, Orbax, Otomax, Panacur, Posatex, Salix, Tri-Heart Plus, Regu-mate, Vetpen, Banamine, Safe-guard, Schirmer, or Vetsulin, Hill's Prescription Diet, Royal Canin Veterinary Diet, Purina Pro Plan Veterinary Diets, Blue Buffalo Natural Veterinary Diet, Sentinel, or Sentinel Spectrum. Subject to Terms. Offer valid through 01/31/2027, while supplies last.
Heartworm Prevention Medicine For Dogs
Reviewed by Dr. Angela Beal, DVM
Heartworms are a type of parasite that are transmitted to dogs through mosquito bites. If an infected mosquito bites your dog, it can pass along heartworm larvae. Without treatment, the worms will mature into adults and potentially infest your dog's heart, lungs, and blood vessels. Once your dog is infected, they will require veterinary care to treat the infection and prevent serious disease and even death. Talk to your vet about heartworm prevention for your dog.
Things to consider when shopping for dog heartworm medication include:
- Your Dog's Weight: Heartworm preventatives are sold based on your dog's weight. Your vet will help you pick the right one. Most brands of medications come in different colored boxes for different weights.
- Administration Route: Heartworm medications are typically available as a tasty chew, but there are also tablets and topical solutions. Choose the one that works best for your situation.
- Frequency: How often do you have to administer the medication? To be effective, heartworm medication must be administered regularly. This will kill any immature heartworms (called microfilariae) in your dog's system before they can mature.
- Targeted Parasites: Many canine heartworm medications are combined with other ingredients that treat various types of fleas and ticks. Talk to your vet about the best combination medication to target the parasites where you live.
If you suspect your dog has been infected, it's important to talk to your vet as soon as possible. In many cases, your dog won't have any symptoms at first. As the worms spread, symptoms may include a persistent cough, problems with exercise, fatigue, and a lower appetite. Treatment for heartworm infection often involves several steps. To help prevent heartworm infection in your dog, ask your vet about heartworm prevention and make sure to have your dog tested at least annually.
Our pharmacy team is available 24/7, 365 days a year. Call Chewy Pharmacy at 1-877-977-3879
Frequently Asked Questions about Heartworm Prevention Medicine For Dogs
How important is heartworm prevention for my dog?
Heartworm prevention is extremely important because heartworm disease can be serious, yet it's largely preventable with consistent, year-round medication. Since heartworms are transmitted by mosquitoes, veterinarians recommend maintaining protection throughout the year, even for dogs who spend most of their time indoors.
Which heartworm preventives are easiest to give dogs?
Many pet parents find flavored chewable heartworm medicines for dogs to be the easiest to administer because they're designed to be palatable. Topical options are also available for dogs who don't readily take oral medications. Your veterinarian can help you choose the form that best fits your dog's needs.
What monthly heartworm preventives work best for dogs?
The best monthly heartworm preventive depends on your dog's age, weight, and lifestyle, and the parasites you want to protect against. Some products focus on heartworm prevention alone, while others also help protect against intestinal worms, fleas, or ticks. Your veterinarian can recommend the most appropriate option for your dog.
Do I need a prescription for heartworm medicine for dogs?
Yes. Heartworm preventives for dogs require veterinary authorization. Before starting or restarting a heartworm preventive, your veterinarian will typically recommend appropriate testing and help determine which product is right for your dog.
Do all heartworm medicines protect against the same parasites?
No. While all approved heartworm preventives are designed to help prevent heartworm disease, many products differ in the additional parasites they cover. Depending on the formula, they may also help protect against intestinal worms, fleas, ticks, or mites, so it's important to review the product's coverage with your veterinarian.
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