SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/dog-heartworm-six-months

How long do heartworm larvae take to grow into adult worms?

About 6 months.

Start playing free

  1. About 6 months ✔
  2. 2 days
  3. About 3 years

Why: After an infected mosquito bite, the larvae take about six months to become adults. Adults can live for 5 to 7 years in a dog.

Huh, didn't know that: Adult heartworms can be about a foot long.

The dad joke
What is the fastest dog in the world? A Labraghini.
Like this card?
Play the game

References

Answer: About 6 months. After an infected mosquito bite, the larvae take about six months to become adults. Adults can live for 5 to 7 years in a dog.

  1. American Heartworm Society, Heartworm Basics www.heartwormsociety.org/pet-owner-resources/heartworm-basics
    it takes approximately 6 months for the larvae to develop into sexually mature adult heartworms
    Checked 2026-10-10.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

DogsHow do dogs get heartworm?DogsHow often should dogs be tested for heartworm, per the American Heartworm Society?DogsHow many months a year should dogs get heartworm preventive?

That's stuff everyone should know.