Spotted fleas on your cat? How to confirm it, choose a safe flea treatment, clear fleas from your home and stop them returning, plus the dog product mistake that can kill cats.
Your cat is scratching more than usual, you've found tiny black specks on its bedding, or you've been bitten on the ankles yourself. Chances are, you're dealing with fleas.
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Fleas are one of the most common problems Australian cat owners face, and they thrive in the warm, humid weather of spring and summer. Even indoor cats can get them, because fleas and their eggs hitch a ride inside on people, other pets and visitors.
The good news is that fleas are very treatable. The key is understanding that the fleas you see on your cat are only a small part of the problem. Below you'll find how to confirm your cat has fleas, how to choose a safe treatment, how to clear fleas from your home, and how to stop them coming back.
Quick answer: how to get rid of fleas on cats
- Confirm it's fleas with a flea comb and the wet tissue test.
- Treat every cat and dog in the home with a vet-recommended flea product made for that species.
- Never use a dog flea product on a cat. RSPCA Australia warns that flea treatments made for dogs can be toxic, and even fatal, to cats.
- Clean your home thoroughly: vacuum carpets, furniture and crevices often, and wash bedding in hot water.
- Keep treating year-round. RSPCA Australia recommends an effective flea preventative all year, chosen with your vet.
Signs your cat has fleas
RSPCA Australia lists these signs of fleas:
- Adult fleas in the fur or on the skin. They're about 1 to 2 mm long, dark brown and fast-moving.
- Flea dirt: small black specks in the fur, which turn red when placed on a wet tissue. This is flea droppings made of digested blood.
- Excessive scratching, licking or grooming, although RSPCA Australia notes that not every cat with fleas will itch.
- Red or irritated skin, scabs and hair loss, often on the back near the tail, the neck and the belly.
Other clues include restlessness, small scabs you can feel when patting your cat, and itchy bites on your own ankles and legs.
The wet tissue test
- Comb your cat with a fine-toothed flea comb, especially along the back near the tail and around the neck.
- Tap the debris from the comb onto a damp white tissue or paper towel.
- Wait a minute. If the black specks spread into red or reddish-brown smudges, it's flea dirt.
If you find flea dirt, your cat has fleas, even if you can't see any live fleas.
Why fleas are more than just itchy
RSPCA Australia explains that fleas can cause irritation, itching, painful skin damage, allergic reactions and infections. In severe cases, especially in very young or very old animals, they can cause anaemia from blood loss. Fleas can also spread disease-causing organisms, including internal parasites.
Kittens are especially vulnerable. A heavy flea burden on a small kitten can become serious quickly. If your kitten seems weak, lethargic or has pale gums, see a vet straight away.
Some cats are allergic to flea saliva. For these cats, even one or two bites can cause intense itching, scabs and hair loss. If your cat is scratching or overgrooming badly, ask your vet whether a flea allergy could be the cause. Our guide on how to tell if your cat is sick explains other signs to watch for.
Understanding the flea life cycle
The secret to beating fleas is understanding where they live. Most of a flea infestation isn't on your cat at all. It's in your home.
How the cycle works
RSPCA Australia explains that adult fleas feed on blood and lay eggs on the animal's fur. The eggs fall off into carpets, furniture, bedding and soil, where they develop into larvae, then pupae, then new adult fleas.
According to the Victorian Department of Health:
- Female fleas lay eggs in clusters of 4 to 8 after a blood meal.
- Eggs hatch in 2 days to 2 weeks.
- The full cycle takes 2 weeks to 8 months, depending on temperature, humidity, food and flea species.
- Pupae stay inside cocoons until they detect a host nearby, for example through vibrations from people or animals.
- Adult fleas can survive many months without feeding.
RSPCA Australia adds that pupae can survive for weeks to months, and that warmth and humidity speed up the cycle.
Why fleas keep coming back
| Stage | Where it lives | Killed by your cat's flea treatment? |
|---|---|---|
| Adult flea | On your cat | Yes |
| Eggs | Fall into carpet, bedding, furniture | Some modern treatments stop eggs developing |
| Larvae | Hide deep in carpet, cracks and bedding | Mostly need environmental cleaning |
| Pupae (cocoons) | Protected in carpet and furniture | Resistant to most products, so new fleas keep hatching |
This is why many owners treat their cat, see the fleas disappear, and then find new ones weeks later. Those new fleas are hatching from pupae in the home. Keep treating your cat consistently, and new fleas that jump on will be killed before they can lay more eggs.
Choosing a safe flea treatment for your cat
Always use a cat product
This is the most important rule. RSPCA Australia warns that flea treatments designed for dogs can be toxic, and even fatal, to cats.
Many dog flea products contain permethrin. The American Association of Feline Practitioners (AAFP) explains that dog permethrin products typically contain 45 to 60% permethrin. Cats' livers can't break it down properly, so it builds up to toxic levels.
The AAFP warns that cats can also be poisoned indirectly by grooming or snuggling up to a dog that has recently been treated. Signs of permethrin poisoning range from restlessness and drooling to muscle tremors, spasms and seizures, and it can be fatal.
If you think your cat has been exposed to a dog flea product, contact your vet or an emergency vet immediately. You can also call the Animal Poisons Helpline on 1300 869 738 for advice.
Types of cat flea treatments
| Type | How it works | Things to know |
|---|---|---|
| Spot-on (topical) | Liquid applied to the skin on the back of the neck | Apply where your cat can't lick it, keep away from other pets until dry |
| Chewable tablet | Given by mouth | Useful for cats that hate spot-ons, some also cover other parasites |
| Flea collar | Releases active ingredients over time | Choose a cat-specific, quick-release collar, check the fit regularly |
| Flea shampoo | Kills fleas present at the time | Short-term only, most cats dislike baths |
| Flea comb | Physically removes fleas | Good for checking and for young kittens, not a full treatment on its own |
RSPCA Australia recommends choosing a flea preventative with your vet, based on your cat's species, age, weight and health. Some products also protect against worms, and some products protect against paralysis ticks, which is important in parts of eastern Australia. See our guide to paralysis ticks in cats.
Safety tips for using flea treatments
- Check the label says it's for cats, and matches your cat's weight.
- Ask your vet before treating kittens, pregnant or nursing cats, and elderly or unwell cats. Many products have minimum age and weight limits.
- Don't double up on products unless your vet tells you to.
- Treat all pets in the house at the same time, using the right product for each species.
- Keep cats away from treated dogs until the dog's treatment is dry, or as the label directs.
- Set a reminder so you don't miss a dose.
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How to get rid of fleas in your house
Treating your home is just as important as treating your cat. RSPCA Australia and the Victorian Department of Health recommend these steps.
Step-by-step home flea clean-up
- Vacuum thoroughly and often. Vacuum carpets, rugs, furniture, cracks in floorboards, skirting boards and under furniture. The Victorian Department of Health advises paying extra attention to seams and joins in carpets and furnishings. Vibrations from the vacuum also encourage pupae to hatch, exposing new fleas to treatment.
- Empty the vacuum straight into a sealed bag and put it in an outside bin.
- Wash bedding in hot water. RSPCA Australia recommends washing pet bedding and frequently used fabrics, such as throws and cushion covers, in hot water.
- Steam clean pet bedding and carpets if you can. The Victorian Department of Health lists vacuuming or steam cleaning as ways to treat pet bedding.
- Treat outdoor areas your cat uses, such as enclosures and favourite resting spots, as RSPCA Australia recommends.
- Ask your vet about home sprays. RSPCA Australia advises asking your vet about safe insecticides. If you use a household flea treatment, follow the label exactly and keep cats out of the area until it's safe.
- Keep going for several weeks. Because pupae can survive for weeks to months, keep vacuuming and treating your pets consistently until no new fleas appear.
If you have a severe infestation
For heavy infestations, a licensed pest controller may be needed. The Victorian Department of Health notes that pesticide treatment should be combined with non-chemical measures, pets and their bedding should be treated at the same time, and occupants may need to leave the home for at least 4 to 6 hours after treatment. Ask the pest controller about products that are safe for homes with cats.
Flea bites on people
Cat fleas will bite people when they're hungry. The Victorian Department of Health explains that flea bites are extremely itchy, that a red, swollen lump usually appears within 30 minutes, and that bites are mostly found on the legs and feet. Scratching can lead to infection.
Clearing fleas from your cat and your home is the best way to stop the bites. See a pharmacist or doctor if bites become infected or very irritated.
Why fleas are worse in spring and summer
The Victorian Department of Health notes that fleas grow best in warm, moist conditions. In much of Australia, flea numbers build up through spring and peak over summer.
That's why RSPCA Australia recommends year-round flea prevention rather than waiting until you see fleas. By the time you notice them, the home is often already full of eggs and larvae.
Flea prevention: keeping fleas away for good
- Use a vet-recommended flea preventative all year, as RSPCA Australia advises.
- Treat all pets in the home, including dogs, with species-specific products.
- Vacuum regularly, especially where your cat sleeps.
- Wash your cat's bedding in hot water every week or two.
- Check your cat with a flea comb regularly, especially in warm weather.
- Keep your cat indoors or in a secure enclosure, which reduces contact with fleas from other animals and wildlife. See our guide to cat enclosures and catios.
- Treat before boarding or sitters. Make sure your cat's flea treatment is up to date before a cattery stay.
Flea checklist
- [ ] I've confirmed fleas with a flea comb and the wet tissue test.
- [ ] I've asked my vet for a cat-specific flea treatment.
- [ ] I've checked the product is for cats and matches my cat's weight.
- [ ] I've treated every pet in the home at the same time.
- [ ] I've kept my cat away from any dog treated with a dog product.
- [ ] I've vacuumed carpets, furniture and crevices, and binned the vacuum contents outside.
- [ ] I've washed all pet bedding and throws in hot water.
- [ ] I've set a reminder for the next flea treatment.
- [ ] I'll keep treating year-round, not just when I see fleas.
Frequently asked questions
How do I know if my cat has fleas?
Look for small dark brown fleas in the fur, black specks of flea dirt, scratching, scabs or hair loss. Comb your cat with a flea comb over a damp white tissue. If the specks turn red, it's flea dirt, and your cat has fleas.
Can indoor cats get fleas?
Yes. Fleas and their eggs can come inside on people, clothing, other pets and visitors. Indoor cats still need regular flea prevention, as RSPCA Australia recommends year-round treatment for all cats.
Can I use my dog's flea treatment on my cat?
No. RSPCA Australia warns that dog flea treatments can be toxic, and even fatal, to cats. Many contain permethrin, which cats can't break down. If your cat has been exposed, contact a vet immediately.
How long does it take to get rid of fleas?
It can take several weeks or longer. The Victorian Department of Health says the flea life cycle takes 2 weeks to 8 months, and pupae in your home can keep hatching. Keep treating all pets and cleaning your home until no new fleas appear.
Why does my cat still have fleas after treatment?
Usually because new fleas are hatching from pupae in your home. Keep treating your cat consistently, treat all pets, vacuum often and wash bedding in hot water. If fleas persist, ask your vet about a different product.
Are fleas dangerous to kittens?
Yes. RSPCA Australia warns that heavy flea burdens can cause anaemia from blood loss, especially in very young animals. Ask your vet before using any flea product on a kitten, since many have minimum age and weight limits.
Do cat fleas bite humans?
Yes. The Victorian Department of Health says flea bites cause extreme itching and red, swollen lumps, usually on the legs and feet. Treating your cat and home is the best way to stop them.
Related guides
Sources
- RSPCA Australia, Understanding fleas and their impact on companion animals
- Victorian Department of Health, Fleas: pest control
- American Association of Feline Practitioners, Permethrin poisoning and cats
- Animal Poisons Helpline, About us
This guide is general information only and is not a substitute for advice from your vet. Always read and follow the label on any flea product.
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