How Do Indoor Cats Get Fleas?

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  • Can indoor cats get fleas?

    Yes, it is possible for indoor cats to get fleas. Unfortunately, fleas are highly adept at finding new animals to infest and that includes cats who are kept indoors.

    Fleas are everywhere, not just on the outdoor tom who roams the neighbourhood. They are determined to find a new host to infest. Only 5% of fleas are adults, living on their host, eggs, pupae and larvae make up the remaining 95% and live in the environment. The lifecycle of the flea is as follows:

    Egg: The female flea lays around 40-50 eggs per day which drop off the cat and into the environment. Flea eggs are a white/cream colour and approximately .5mm long.

    Larvae: Eggs hatch into maggot-like larvae after a week. Larvae live in nooks and crannies, under furniture, in carpets and rugs, they feed on organic debris such as adult flea feces.

    Pupae: After two weeks, larvae cocoon themselves into pupae.

    Adult flea emerges: Fleas can remain as adults ready to emerge from their protective pupae in as little as two weeks. However, they need a stimulus to emerge. Heat, carbon dioxide and vibrations stimulate the adult flea to emerge from its cocoon. In the absence of these stimulants, the flea can remain in its cocoon for up to 5-6 months. The adult flea starts to lay her eggs within 24 hours of her first blood meal.

    Fleas thrive in dark, warm and humid conditions.


    From you or other visitors: You and other people visiting your home could be inadvertently infecting your cat with fleas when they hitchhike a ride in on your clothing or shoes. This could be from the pet of a friend you have visited or one who hopped onto you from the environment.

    Wild animals such as rats or possums can introduce fleas to your home via crawlspaces, windows or attics.

    From the garden: Fleas can live both inside and outside the home. Fleas can easily be introduced to your garden via neighbourhood, stray or feral cats, dogs and wild animals. Even if your cat never goes outside, it is still possible for a flea to enter the house through a window or hitchhike a ride in on a person.

    From the home: It is also possible for cats to acquire a flea infestation from the home itself. This may be the case if you have moved into a new home that may have flea pupae in their dormant state. This happened to our cats when we moved into a rental and within a short period of time, our cats had a heavy infestation of fleas, which not only liked the cats but took the occasional bite from us, human occupants, also.

    From outside the home: Cats can be exposed to fleas any time they leave the home to visit the veterinarian, boarding cattery or pet groomer. This may be from dormant pupae or a flea hopping from one animal to another.

    An adult flea can live for 1-2 weeks without a blood meal and is capable of jumping 8 inches vertically and 13 inches horizontally.

    What do fleas look like on cats?

    The cat flea is small, dark brown and may be visible in the fur, fleas are easier to see on light coloured cats.

    Signs of fleas on cats

    The most common sign your cat has fleas is scratching. Some cats will be particularly sensitive to the saliva from a flea bite and develop dermatitis, with crusting on the skin, especially near the base of the tail and around the neck. Cats (and especially kittens) with a heavy infestation can become anemic due to blood loss. Pale gums are a sign of anemia in cats.

    • Check your cat carefully for the presence of adult fleas in the coat. Fleas are dark brown in colour and 1-2mm in length. It is easier to see fleas in cats with light coloured coats.
    • Get a fine-toothed flea comb and carefully comb through your cat’s fur to look for fleas or their feces.
    • If you can’t see any fleas but still suspect your cat is infested, grab one or two pieces of white A4 paper and lightly spray them with water. Stand your cat on the paper (this may take two people) and rough up his coat. Feces should fall off your cat and onto the paper. This has the appearance of pepper and once it hits the damp paper a red circle will appear (which is the digested blood from your cat).
    • Check areas your cat sleeps for salt and pepper-like residue, which are eggs (white) and feces (brown).


    This is a two-pronged approach, treat your cat and the environment.

    The most effective products are available from your veterinarian. There are a number of different types on the market, below is a list of some effective flea products, but these may vary from country to country.


    • Comfortis
    • Sentinel
    • Capstar

    Topical solutions

    • Revolution
    • Advantage
    • Program
    • Frontline
    • Activyl
    • Advocate


    • Frontline
    • Advantage

    Treat the environment

    It is important to treat the environment as well. Vacuum your home including under furniture, along skirting boards and in nooks and crannies.

    Wash all pet bedding in hot water. Either tumble dry or hang out to dry in the sun.

    The house will need to be sprayed. You can either buy a ‘flea bomb’ from your local supermarket or hire a pest controller. I always recommend the second. If you bring somebody in to spray for fleas, tell him you have cats beforehand as some insect sprays are toxic to cats.

    Fleas are a massive nuisance to both your cat and the homeowner. Once you have treated your cat (and home) for fleas, use a regular flea preventative.

    Diseases transmitted by fleas

    Fleas are more than a pest to your cat, they are also capable of transmitting several diseases including:

    • Tapeworm
    • Plague
    • Tularemia
    • Feline infectious anemia
    • Bartonella henselae
    • Rickettsia

    Other causes of itching

    There are a number of other possible causes of itchiness such as:

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    • Julia Wilson, 'Cat World' Founder

      Julia Wilson is the founder of Cat-World, and has researched and written over 1,000 articles about cats. She is a cat expert with over 20 years of experience writing about a wide range of cat topics, with a special interest in cat health, welfare and preventative care. Julia lives in Sydney with her family, four cats and two dogs. Full author bio