If you spotted something crawling in your cat’s fur and your stomach just dropped, take a breath. Lice on a cat sound alarming, but they’re actually one of the rarer parasites a vet will diagnose, and one of the easier ones to clear up.
Here’s the thing: most itchy, flaky, or scabby cats turn out to have fleas, mites, or a skin allergy instead. Lice do happen, though, especially in cats living outdoors, in shelters, or in crowded multi-cat households. Let’s go through what cat lice actually are, how to spot them, and what your vet will do about it.
Can Cats Get Lice?
Yes, cats can get lice, though it’s not common in cats that are healthy, indoor, and well-groomed. Lice infestations, called pediculosis, show up most often in outdoor cats, feral colonies, senior cats, kittens, and cats that are sick, malnourished, or living in crowded conditions. A cat’s immune system and normal grooming habits usually keep lice numbers low or wipe them out entirely before they become a real problem.
Vets do see it, though, and it’s worth knowing the signs. According to the Merck Veterinary Manual, the spread of monthly flea and tick preventives has made lice rare in cats. When they do show up, it’s usually on older longhaired cats that can no longer groom themselves, or on stray, feral, shelter, and debilitated cats. Merck also notes lice are most common in the colder months and hard to find in summer.
What Are Cat Lice?
Cat lice are tiny, wingless insects from the species Felicola subrostratus, and they’re the only louse species that infests cats. This is a chewing louse (sometimes called a biting louse), which means it feeds on dead skin cells, skin debris, and dander rather than blood. Adult lice are pale tan to grayish, about 1 to 2 mm long, roughly the size of a grain of sand, and they have a flattened body built for gripping onto hair shafts.
Female lice glue their eggs, called nits, to individual strands of your cat’s fur close to the skin. Those eggs hatch in about one to two weeks, and the whole life cycle from egg to egg-laying adult takes around three to four weeks. Because lice spend their entire life on the host, an infestation can build up fast in a cat that isn’t grooming well or isn’t getting treated.
What Are the Signs of Lice in Cats?
The most obvious sign of lice in cats is visible nits stuck to the fur, paired with intense itching and a dull, unkempt coat. Cats with lice often scratch, bite, or over-groom themselves constantly, which can lead to hair loss, thinning fur, and small scabs from broken skin.
- White or tan specks (nits) glued tightly to hair shafts, especially around the head, neck, shoulders, and base of the tail
- Constant scratching, licking, or chewing at the coat
- Patchy hair loss or a matted, greasy-looking coat
- A generally dull, unhealthy appearance to the fur
- Restlessness or trouble settling, since the itching can be relentless
- In heavy infestations, small crawling insects visible in the fur, particularly if you part the hair near the skin
Kittens, senior cats, and cats already fighting an illness can be hit harder by a heavy infestation. It’s a good reminder not to brush off ongoing scratching as “just a cat thing.”
How Do Cats Get Lice?
Cats get lice through direct contact with an already-infested cat, or by sharing items like bedding, brushes, or carriers that have live lice or eggs on them. Unlike fleas, lice cannot jump or fly. They crawl, and they need close, sustained contact to move from one cat to another.
This is why lice show up more in specific situations:
- Multi-cat households or shelters with close, ongoing contact between cats
- Outdoor and feral cats who interact with other cats they don’t live with
- Cats in poor body condition who aren’t grooming themselves properly
- Senior or chronically ill cats with weaker immune systems
- Kittens, who groom less thoroughly and have less developed immunity
A cat that stays indoors, lives alone or with cats it’s bonded to, and gets regular grooming and vet care has a genuinely low risk of ever picking up lice.
Are Cat Lice Contagious to Humans or Dogs?
No, cat lice are not contagious to humans or dogs. Felicola subrostratus is species-specific, which means it has evolved to survive only on cats and cannot complete its life cycle on any other species. If a louse from your cat ends up on your skin or your dog’s fur, it simply cannot feed or reproduce there, and it will die off on its own.
This species-specificity holds true for lice in general, not just the cat louse. Dogs have their own distinct louse species, and humans have separate louse species too (head lice, body lice, and pubic lice), none of which cross over to cats. If you’re also dealing with a dog in the house, it genuinely cannot catch lice from your cat, and vice versa.
Cat Lice vs Fleas: What’s the Difference?
Cat lice and fleas are different parasites entirely, and telling them apart matters because they’re treated with different approaches. Fleas jump, bite for blood, and can spread to other pets and even bite people. Cat lice crawl slowly, mostly feed on skin debris, and stay locked onto one cat for their whole life.
| Feature | Cat Lice | Fleas |
|---|---|---|
| Size | About 1 to 2 mm, flattened and pale tan | About 1 to 3 mm, dark reddish-brown, flattened side to side |
| Movement | Crawl slowly, cannot jump or fly | Jump long distances (up to 100+ times their body length) |
| Host-specificity | Highly species-specific; stays on cats only | Less host-specific; can bite dogs, cats, and people |
| Feeding | Chews on skin debris and dander, not blood | Bites through skin to feed on blood |
| Eggs | Nits glued firmly to individual hair shafts | Eggs are loose and fall off into bedding and carpet |
Fleas are also the bigger worry of the two. The Cornell Feline Health Center notes that one female flea lays at least 20 eggs a day, enough to produce about 20,000 new fleas in 60 days, and that heavy flea loads can make kittens anemic. Lice, which chew skin debris rather than drink blood, don’t carry that risk in the same way.
If you’re not sure which one you’re dealing with, our guide on how to tell if your cat has fleas walks through the signs, and you can compare it against what a flea bite looks like on a cat to help narrow it down before your vet visit.
How Are Cat Lice Treated?
Cat lice are treated with a vet-prescribed topical or spot-on medication that kills adult lice, followed by a repeat treatment to catch lice that hatch after the first dose. Merck suggests repeating 7 to 10 days after the first treatment, since eggs can keep hatching for 2 to 3 weeks. Your vet needs to confirm lice under a microscope or magnifying lens first, since the symptoms overlap with fleas, mites, ringworm, and allergies.
Treatment usually involves a few pieces working together:
- A confirmed diagnosis from your vet, since treating the wrong parasite wastes time and won’t clear the itching
- A vet-approved topical treatment applied to the cat, chosen based on age, weight, and health status
- A follow-up dose, often 7 to 10 days later, to kill lice that hatched from surviving eggs
- Washing bedding, brushes, and carriers in hot water to remove any stray eggs or lice
- Separating an infested cat from other cats in the home until your vet confirms the infestation has cleared
Never medicate your cat on your own or use dog flea and lice products on a cat, since some ingredients that are safe for dogs are toxic to cats. Your vet will pick a product and dosing schedule that’s safe for your cat’s specific situation. PetMD notes that most cats respond well to treatment within a few weeks once the right product and follow-up schedule are in place. While you’re at it, ask your vet for a broader parasite check, since our guide on how cats get tapeworms covers another common culprit behind an itchy, unsettled cat.
When Should You See a Vet About Cat Lice?
This article is general education to help you recognize the signs of lice in cats, not a diagnosis. See a licensed veterinarian within a few days if you notice any of the following, and sooner for a weak kitten or a cat that has stopped eating:
- Visible nits or crawling insects in your cat’s fur
- Constant scratching, biting, or grooming that isn’t easing up
- Patchy hair loss, scabs, or a coat that looks unhealthy
- A kitten, senior cat, or already-unwell cat showing any of these signs, since they’re more vulnerable to complications
- Symptoms that don’t improve after a round of treatment, which can mean it’s actually mites, ringworm, or an allergy instead
A vet visit is the only reliable way to confirm lice versus a lookalike condition like ear mites or ringworm, both of which cause similar scratching and coat changes but need completely different treatment.
More cat lice questions
Q: Can indoor cats get lice?
Indoor cats can get lice, but it’s rare since lice spread through direct contact with an infested cat or shared grooming tools. An indoor cat that doesn’t interact with other cats or borrowed bedding has a very low risk.
Q: How long do cat lice live off the host?
Cat lice generally survive only a few days away from a cat’s body, since they depend on the host for warmth and food. Nits glued to fur, however, can remain viable and hatch even after being brushed onto bedding.
Q: What do cat lice eggs look like?
Cat lice eggs, or nits, look like tiny white to tan specks firmly glued to individual hair shafts close to the skin. Unlike ordinary flakes of dandruff, nits won’t brush or shake off easily.
Q: What’s the difference between cat lice and cat dandruff?
Cat dandruff is loose, flaky skin that brushes away easily, while lice nits are eggs glued tightly to the hair shaft that won’t budge with a simple brush. If you’re seeing persistent white specks that stay put, it’s worth checking with your vet rather than assuming it’s just dry, flaky skin.
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