How do I know if my cat has fleas?

Excessive scratching, grooming, and the presence of small, dark specks (flea dirt) in your cat's fur are common signs. You might also see the small, fast-moving adult fleas themselves.

How often should I treat my cat for fleas?

The frequency of flea treatment depends on the specific product and your cat's lifestyle. Most topical and oral treatments are applied monthly, but always follow the product label and your vet's instructions.

Do I need to treat my indoor cat for fleas?

Yes, even indoor cats can get fleas. Fleas can be brought into your home on clothing, other pets, or even by wildlife. Therefore, year-round prevention is recommended.

I used the treatment, why am I still seeing fleas?

This is not an uncommon problem, but understandably it can be super frustrating to still see pesky fleas on your cat after you have given them a flea treatment. The most common reason for this is to do with that 95% of the flea lifecycle which are living in the environment your cat lives in. While adult fleas are being killed by the treatment, there are likely to be new juvenile adult fleas jumping on and hitching a ride all the time. Depending on the product you are using, it can take some time for these fleas to die. Over time, as your cat acts as a flea killing machine killing all adult fleas in its path, the levels of flea larvae and pupae in the environment will drop off and there will be less reinfestation. So it pays to be persistent and keep up with those monthly doses! If your cat is particularly sensitive to the fleas or there is a heavy infestation in the environment, you can add Capstar , a short acting treatment which kills fleas super fast, when needed for quick relief. Basically if you are still seeing fleas on your cat, they are most likely still picking up fleas from the environment. Although you've broken the lifecycle of the fleas with an effective treatment, treating the environment and treating all your other pets will help to speed up the flea eradication process.

How do I treat my home for fleas?

Thoroughly vacuuming carpets and furniture, washing bedding, and using an environmental flea spray are essential for eliminating fleas in your home. For heavy infestations, professional pest control may be necessary.

Can people catch fleas from cats?

While fleas can definitely bite humans, they are not able to live on our bodies. It's important to note that fleas can carry harmful bacteria which can be responsible for serious illness in humans including Bartonella henselae (cat scratch disease) and even Yersinia pestis (plague)!

Last Updated: 10/06/2026

How to Treat a Cat with Fleas

Learn how to get rid of your cat's fleas for good with our vet authored guide.

Author: Dr Teagan Lever BVSc (Hons)

Reading Time: 6 minutes - short read

Cats tend to be quite thorough in grooming themselves, which may result in flea infestations going unnoticed and untreated. Fleas are not only irritating to your prized feline, they can also cause flea allergy dermatitis (FAD) resulting in hair loss, sores and crusty bumps. Wondering how your cat got fleas in the first place? See How Do Cats Get Fleas, and if your cat lives exclusively indoors, see Can Indoor Cats Get Fleas? - they're more at risk than most owners realise.

While failing to keep your cat's flea treatment up to date is likely to result in an unhappy, itchy kitty, it can also result in an infestation breaking out in your home. If this has happened to your house, do not fret. You can be rid of the fleas yourself without the need for calling in the exterminators.

What are the signs of flea infestation in cats?

Often pet parents are surprised to learn that their cat has fleas. Because cats are such thorough groomers, it is possible for them to have signs of flea infestation without fleas being readily visible in their coat. Some common signs of flea infestation in cats include:

Scratching and grooming more than usual
Hair loss or thinning
Formation of crusts and scabs on the skin
Flea 'dirt' present in the coat, particularly in harder to reach places like around the base of the tail

Left untreated, heavy flea infestations can result in anaemia from chronic blood loss. Fleas can also transmit parasites and serious bacterial infections which can affect both pets and people, including Bartonella henselae and even Yersinia pestis, also known as plague!

How can you tell if your cat has fleas?

If you suspect your cat may have fleas, there is a handy trick that vets use to check, all you need is a fine tooth comb and a piece of damp paper towel. Use the comb to pick up any 'dirt' that you are able to find in your cat's coat, and then wipe it onto the damp paper towel. If the paper towel stains a reddish-brown, rusty colour, it's an indication that the substance is flea 'dirt' (faeces) containing blood. If flea dirt is present, your cat definitely does have fleas.

Why does the flea lifecycle matter for treatment?

95% of the flea lifecycle occurs off your pet - eggs drop into bedding and carpet, where pupae can lie dormant for up to 6 months before hatching. This means that even after you've treated your cat, new fleas can keep emerging from your home environment for months - which is why treating your pet alone is rarely enough to clear an infestation.

For an in-depth discussion on the flea lifecycle, see How Do Cats Get Fleas?

How do you get rid of fleas on a cat?

To successfully get rid of fleas, you need to do more than just kill the fleas on your pet. In order to prevent your pet being reinfested, it is critical to completely break the flea lifecycle. This is why just using a short acting flea shampoo or spray alone will not be effective.

Use flea prevention year round

Effective flea treatments can both eliminate existing infestations and prevent future ones. To ensure your cat stays protected, consider the following:

Product Selection: Choose between flea-only formulas or "all-in-one" products that also cover ticks and worms, depending on your local environment.
The Pupal Phase: Flea pupae can remain dormant in your home for up to 6 months, meaning new fleas may emerge long after you begin treatment.
Continuous Protection: Maintaining a consistent preventative schedule is vital; it ensures any newly emerged fleas die shortly after jumping onto your pet.

For a complete guide to keeping your cat covered year-round, see A Vet's Guide to Flea, Tick and Worming for Cats.

Treat all pets in the household

Use flea prevention for every cat and dog in the household, even if they aren't scratching. Untreated pets act as "reservoirs" that keep the flea lifecycle active. For guidance covering both dogs and cats, see our guide to fleas, ticks and worms.

Treat the environment around you

Flea eggs, larvae, pupae and adult fleas will drop off your pet into other areas of your home. Materials like bedding, toys and carpet are ideal living areas for the flea family. If your cat is suffering from fleas, about 95% of the total flea problem is likely to be in your house rather than on your cat.

Treating the environment, as well as your pet, will wipe out the infestation much quicker.

Sanitise bedding: Wash all pet bedding and fabric toys on a hot cycle (60°C) and use a dryer on high heat to kill eggs and larvae.
Vacuum thoroughly: Frequent vacuuming or steam cleaning helps remove dormant pupae from carpet fibres.
Use caution with chemicals: If using flea bombs or room sprays, ensure they are dry and the area is ventilated before letting cats return. Note: Many environmental sprays contain Permethrin, which is highly toxic to cats.

What safety precautions should you know before treating your cat for fleas?

While treating your cat for fleas is important, there are some safety aspects you should keep in mind before you administer any medications:

Never use dog medications on your cat! Using dog specific medications on your cat can kill them or cause severe health concerns requiring hospitalisation
If you have both dogs and cats in your house, do not treat your dogs with any product labelled as dangerous for cats.
When applying a topical treatment to your cat, do not allow them or another cat to groom the area until the fur is completely dry
Weigh your cat so that you can choose the right sized dose

What are the top flea treatments for cats?

Not sure which product is right for your cat? See Which Flea and Worming Product Does Your Cat Need? or our vet's top picks in Best Flea and Tick Treatments for Cats.

Shop all cat flea treatments

Flea treatment FAQs

Keep your cat's flea treatments up to date all year round - your cat, your household, and everyone in it will thank you for it.

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History

Our experts continually monitor the health and wellness space and we update our articles when new information becomes available.

Wed 10 Jun 2026

Edited by Dr Gillian Hill BVSc (Hons)

View more history

About the Author

Dr Teagan Lever BVSc (Hons)

Head Veterinarian, BVSc (Hons)

Pet Circle's Head Veterinarian, Dr Teagan graduated from the University of Queensland in 2010 and went on to work in small animal and mixed practice in various locations around QLD & ACT before joining Pet Circle in early 2016. Dr Teagan has special interests in dermatology, nutrition and preventative health care. She feels privileged to witness the special bond people share with their pets on a daily basis and enjoys forming lasting relationships with pet parents and their fur children.