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

How many months a year should dogs get heartworm preventive?

All 12 months, year-round.

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  1. All 12 months ✔
  2. Only the 3 summer months
  3. About 6 months

Why: The American Heartworm Society advises giving heartworm preventive every month of the year. Mosquitoes can show up outside normal seasons, and even indoor dogs can be bitten.

Huh, didn't know that: The AHS calls this 'think 12': test every 12 months and give preventive 12 months a year.

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Our dog brings us the newspaper every day. Funny thing is, we've never subscribed to any.
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References

Answer: All 12 months. The American Heartworm Society advises giving heartworm preventive every month of the year. Mosquitoes can show up outside normal seasons, and even indoor dogs can be bitten.

  1. American Heartworm Society, Heartworm Basics www.heartwormsociety.org/pet-owner-resources/heartworm-basics
    heartworm preventive 12 months a year
    Checked 2026-10-10.

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