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SESK: Stuff Everyone Should Know · sesk.info/dog-heartworm-50-states

In how many US states has heartworm disease been diagnosed?

All 50 states.

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  1. Only southern states
  2. Only about 10 states
  3. All 50 states ✔

Why: Heartworm is not just a southern problem. It has been found in dogs in every state, which is why testing and prevention are advised everywhere.

Huh, didn't know that: Risk changes with local mosquito numbers, so ask your vet about your area.

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References

Answer: All 50 states. Heartworm is not just a southern problem. It has been found in dogs in every state, which is why testing and prevention are advised everywhere.

  1. American Heartworm Society, Heartworm Basics www.heartwormsociety.org/pet-owner-resources/heartworm-basics
    heartworm disease has been diagnosed in all 50 states
    Checked 2026-10-10.

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