Fleas on Cats: Safe Treatment and Prevention

Quick answer

Treat a cat with fleas using a product licensed specifically for cats, picked with your vet and dosed for your cat's weight. Treat every cat and dog in the home at the same time and give the house a thorough clean, because most of the flea population isn't on the animal at all. It sits in carpets and bedding as eggs, larvae and pupae. Never use dog flea products on cats. Some contain permethrin, which can kill them.

How to tell if your cat has fleas

Fleas are small, dark-brown and quick, about 1–3 mm (under 1/8 inch) long. You may never actually see one, especially on a cat that grooms a lot. Look for:

• Scratching, over-grooming or nibbling, often at the base of the tail, neck and belly
• Thinning fur or a "barbered" look on the belly or back legs
• Small scabs, especially along the back and neck
• Flea dirt: tiny black specks in the coat

The wet paper test: comb your cat over a sheet of damp white paper or kitchen towel. Flea dirt is digested blood, so the specks spread into reddish-brown smudges. Ordinary dirt stays black.

A fine-toothed flea comb is the best tool for checking. Work it along the back, around the neck and near the tail.

Why fleas matter

Itching is only part of it. Fleas can also cause:

• Flea allergy dermatitis. Some cats are allergic to flea saliva, so a handful of bites is enough for intense itching, scabs and hair loss.
• Anaemia. Heavy infestations can cause dangerous blood loss, especially in kittens. A flea-covered kitten with pale gums and weakness needs a vet urgently.
• Tapeworms. Cats pick up a common tapeworm by swallowing fleas while grooming. Segments like grains of rice around the bottom or in the bedding give it away.

Fleas can carry some bacteria too, which affect cats and occasionally people.

Understanding the flea life cycle

Getting rid of fleas makes a lot more sense once you know where they live:

1. Adult fleas live on the cat, feed and lay eggs.
2. Eggs fall off into bedding, carpets, sofas and cracks in floors.
3. Larvae hatch and hide deep in fibres, away from light.
4. Pupae form in tough cocoons that shrug off most treatments. They can wait weeks, sometimes months, before hatching, set off by warmth, vibration and carbon dioxide from a passing animal.

So a single treatment rarely fixes things. The adults on the cat die, but new fleas keep coming out of the home for weeks.

Safe treatment for the cat

Your vet can suggest the right product for your cat's age, weight, health and lifestyle. The usual types are:

Safety rules:

• Use only products labelled for cats, and read the label every time.
• Never split a large-dog pipette between cats or use a dog product "at a lower dose".
• Dose by your cat's current weight. If you're not sure, weigh them.
• Check the minimum age and weight on the label before using anything on a kitten. For very young kittens, ask your vet; a flea comb may be the safest place to start.
• Don't combine flea products unless your vet tells you to.
• If your cats groom each other, keep a newly treated cat apart until the spot-on has dried.
• Steer clear of essential oils and "natural" remedies. Some oils, such as tea tree, are toxic to cats.

Stick to your vet's dosing and repeat treatments exactly on schedule, usually monthly or at whatever interval the product states.

Treat every pet in the home

Dogs, other cats and sometimes rabbits and ferrets in the same house can all carry cat fleas. Treat only one animal and the others keep the cycle going. Each species needs its own correct product.

Clearing fleas from your home

• Vacuum daily for a couple of weeks: sofas, under furniture, along skirting boards, and the car. The vibration coaxes pupae to hatch, which exposes the new fleas to treatment. Empty the vacuum outside.
• Wash bedding on a hot wash. That means pet bedding and your own, if the cat sleeps on beds.
• Household flea sprays can help kill eggs and larvae. Use one your vet recommends, keep pets and people out of the room as the label says, and never spray your cat directly. Some household sprays contain permethrin and have to be completely dry before cats come back in. Cover fish tanks.
• Keep at it for several weeks. Seeing a few fleas after treatment is normal while pupae hatch, and it doesn't necessarily mean the product has failed.

Prevention

• Use regular, year-round flea prevention if your cat goes outdoors or lives with dogs, or wherever your vet advises it.
• Run a flea comb through your cat weekly to catch problems early.
• Treat new pets before they join the household.
• Once fleas have been around, worm your cat for tapeworm as your vet advises.

When to see a vet

Contact a vet promptly if:

• Your cat drools, twitches, trembles, wobbles or has a seizure after any flea treatment. This can be poisoning and is an emergency: go to a vet straight away and take the packaging with you. If a spot-on was used, your vet may tell you to wash it off with mild dish soap.
• A kitten with fleas is weak or cold, or has pale gums.
• Your cat has open sores or widespread hair loss, or is scratching itself raw.
• Fleas keep coming back even though you've treated all the pets and the home.

For general advice on keeping a cat healthy, see our cat care guide for beginners. Dog owners should also read ticks on dogs, since many parasite products cover both.

In Pakistan

Warm, humid weather across much of Pakistan lets fleas breed for most of the year, so ongoing prevention is usually more practical than chasing outbreaks. Pet shops stock plenty of flea products, some meant only for dogs and some with unclear labels. Check that the packaging clearly says it's for cats, shows weight bands and comes from a reputable source, and ask your vet if in doubt. Stray cats are common in many neighbourhoods, so cats that go in and out get re-exposed again and again.