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What does heartworm prevention mean?

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Heartworm preventives work by treating heartworms that already infected the pet within the past month or longer; meanwhile, preventives need to be given on time, every time to be effective. That's why the American Heartworm Society recommends year-round heartworm prevention for pets.


Do dogs really need heartworm prevention?

One of the most common questions heard by our veterinarians during an annual wellness exam is, “Does my pet really need heartworm prevention?” To put it simply: yes! Even if your pet is considered “indoors-only,” all cats and dogs should be on a heartworm prevention medication.

What does heartworm prevention do?

How do monthly heartworm preventives work? Whether the preventive you choose is given as a pill, a spot-on topical medication or as an injection, all approved heartworm medications work by eliminating the immature (larval) stages of the heartworm parasite.

Why do dogs need heartworm prevention?

Heartworm disease is a very serious parasitic disease that has the potential to be fatal for your dog if he is not treated quickly. This parasite is a worm that can grow up to a foot long and lives inside the heart, lungs, and associated blood vessels of an infected animal where it will reproduce over and over.

What happens after heartworm prevention?

The dog may be required to stay at the hospital for 3-4 days. After treatment, the adult worms die and are carried by the blood to the lungs where they lodge in small blood vessels. There they decompose and are absorbed by the body over a period of several months.

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