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SESK: Stuff Everyone Should Know · sesk.info/dog-heartworm-where

Where do adult heartworms live in a dog?

In the heart, lungs and nearby blood vessels.

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  1. In the stomach
  2. In the heart, lungs and blood vessels ✔
  3. In the ears

Why: Adult heartworms are long worms that live in the heart, lungs and the blood vessels around them. That is why the disease can hurt a dog's heart and breathing.

Huh, didn't know that: A dog can carry several hundred worms.

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References

Answer: In the heart, lungs and blood vessels. Adult heartworms are long worms that live in the heart, lungs and the blood vessels around them. That is why the disease can hurt a dog's heart and breathing.

  1. American Heartworm Society, Heartworm Basics www.heartwormsociety.org/pet-owner-resources/heartworm-basics
    foot-long worms (heartworms) that live in the heart, lungs and associated blood vessels
    Checked 2026-10-10.

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