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Fleas

Tiny, wingless, jumping insects that feed on the blood of pets and people. Most of a flea population lives in carpets, bedding and yards as eggs, larvae and pupae, not on the pet.

Written by PestMan Editorial TeamTechnical review pendingPublished Updated
Most common
Cat flea (on cats and dogs)
Where most live
Carpets and bedding, not the pet
Dormant pupae
Weeks to months
Peak
Warm, humid months
Risk level
Low to moderate

Flea identification

How to recognise fleas

  • Adults 1–3 mm, dark reddish-brown, flattened side to side.
  • Jump powerfully; no wings.
  • Flea "dirt" (digested blood) looks like black specks that turn red on damp paper.

Flea overview

The cat flea (Ctenocephalides felis) is the most common flea on both cats and dogs in Australia and will bite people when pets are unavailable.

Adult fleas on an animal are only a small part of an infestation. Eggs fall into carpets, bedding and soil, where larvae develop and pupate. Pupae can wait for weeks in a protective cocoon until vibration, warmth or carbon dioxide signals a host is near, which explains fleas appearing in homes without pets.

Behaviour

  • Adults stay on the host once they find one.
  • Newly emerged fleas jump onto the first host available, including people.
  • Activity rises in warm, humid weather.

Habitat

  • Pet bedding, carpets, rugs, couches and car interiors.
  • Shaded, moist areas of yards where pets rest; under houses.

Lifecycle

  • Egg → larva → pupa → adult. In warm conditions the cycle can complete in two to three weeks.
  • Pupae can remain dormant in their cocoons for weeks to months, which is why fleas can seem to return after treatment.

Food sources

  • Adults feed on blood.
  • Larvae feed on organic debris and adult flea dirt.

Entry points

  • Pets, visiting animals and wildlife such as possums.
  • Moving into a home where previous occupants had pets.

Infestation signs

  • Pets scratching, biting at fur, especially around the tail base.
  • Small, itchy bites around ankles and lower legs.
  • Flea dirt in pet bedding.

Health implications

  • Flea bites cause itching and can trigger flea allergy dermatitis in pets.
  • Fleas can transmit tapeworm to pets that swallow them.

Prevention

  • Keep pets on a vet-recommended flea prevention program all year round.
  • Vacuum carpets, furniture and pet areas frequently and wash pet bedding hot.
  • Discourage wildlife from living under houses.

Treatment overview

  • Treat every pet at the same time with vet-recommended products.
  • Treat the environment: vacuum daily for several weeks to trigger pupae to hatch and remove eggs and larvae.
  • Professional treatments may include insect growth regulators that stop development. Expect some fleas to keep emerging for a few weeks.
Product safety

If you use any pest product, read the label first and follow it exactly — it is a legal requirement in Australia. Keep products away from children, pets and food areas as the label directs.

Questions about fleas

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Bed bugs

Small, flat, blood-feeding insects that hide in mattress seams, bed frames and furniture near where people sleep. They spread in luggage and second-hand furniture, not because of poor hygiene.

Mosquitoes

Small biting flies that breed in still water. Beyond itchy bites, some Australian mosquitoes spread viruses such as Ross River virus, so reducing bites and breeding sites matters.

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Sources & further reading

PestMan provides general information only and does not replace licensed pest-management, medical, veterinary or structural advice. Always read and follow product labels. Read our disclaimer.