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SESK: Stuff Everyone Should Know · sesk.info/dog-flea-stages

How many life stages do most fleas have?

Four: egg, larva, pupa and adult.

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  1. Two
  2. Three
  3. Four ✔

Why: Fleas go through egg, larva, pupa (in a cocoon) and adult stages. Only the adults live on animals, which is why treating the home matters.

Huh, didn't know that: CDC says the cocoon protects the pupa for several days or weeks until adult fleas are ready to emerge.

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How do you start an insect race? One, two, flea, go!
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References

Answer: Four. Fleas go through egg, larva, pupa (in a cocoon) and adult stages. Only the adults live on animals, which is why treating the home matters.

  1. CDC, Flea Lifecycles www.cdc.gov/fleas/about/flea-lifecycles.html
    Most fleas have four life stages: egg, larva, pupa (in a cocoon), and adult.
    Checked 2026-10-10.
  2. AVMA, External parasites www.avma.org/resources-tools/pet-owners/petcare/external-parasites
    Carpets and bedding provide protection for developing fleas.
    Checked 2026-10-10.

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