Last Updated: 06/04/2026
How To Treat 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: 7 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 dermatitis resulting in hair loss, sores and crusty bumps.
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.
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 to 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.
The flea lifecycle
95% of the flea lifecycle actually occurs off your pet, which means that any adult fleas you are seeing are just the tip of the iceberg.
- Adult fleas live on the pet, feeding on blood and laying eggs in the fur.
- Flea eggs drop off in areas where your pet sits or sleeps and hatch into a larval stage.
- Flea larvae burrow down and then encase themselves in a cocoon to become the pupal stage.
- Flea pupae can lie dormant for up to 6 months! Once stimulated by vibrations and movement nearby, the baby flea hatches from the cocoon and jumps onto a nearby pet, completing the whole annoying cycle.
When a female flea lays up to 50 eggs a day, it means that one flea can become one million fleas in as little as 6 weeks! Feeling itchy yet?
How to get rid of fleas
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.
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.
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.
Safety considerations
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
Top flea treatments for cats
Flea treatment FAQs
Keep your cat healthy and happy by keeping their flea treatments up to date all year around. Your family, and household, will benefit immensely from diligently treating against this common bloodsucking parasite, which has the potential to make everyone's life miserable.
Remember to always follow the label as directed when it comes to medication and flea bombs. For example, you must never use a dog flea medication on your cat unless it is approved by the manufacturer for use in both species.
For best results, treat the environment and any other pets you own. Using a flea treatment on your cat will eventually rid your house of fleas however depending on the severity of the infestation, this could take a couple of months.
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History
Our experts continually monitor the health and wellness space and we update our articles when new information becomes available.
Tue 7 Apr 2026
Edited by Dr Gillian Hill BVSc (Hons)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.
