Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Cat Lice vs Fleas: Vet-Reviewed Key Differences

Share

Lice VS Fleas

Sooner or later, every pet owner will find tiny bugs crawling on their pet’s skin. But are they fleas or cat lice? It can be hard to tell the difference between the two small pests.

Therefore, this article will teach you everything that you need to know about cat lice and fleas. With either one, an infestation on your cat is an issue that needs to be taken care of to get your pet back to optimal health.

divider cat paw scratch oct 2024

Visual Differences

side by side Lice VS Fleas
Image Credit: Left – Ferdinand Roy Karaeng, Shutterstock | Right – Vera Larina, Shutterstock

At a Glance

Cat Lice
  • Size: 1–2 mm
  • Lifespan: 1–2 days without a host, 4 weeks total
  • Body Shape: Oval
Fleas
  • Size: 1.5–4 mm
  • Lifespan: 12–14 days, up to 350 days
  • Body Shape: Flattened oval

divider cat paw scratch oct 2024

Cat Lice Overview

Cat lice are small flightless insects. They live on the hair or feathers of animals and people. There are a few different types of lice, but the cat louse (Felicola subrostrata) is similar to the one that humans can get. Cat lice chew and bite and are usually seen on older cats with longer hair. Poor grooming habits increase your cat’s chance of contracting them.

Cat lice prefer to live in environments where they have access to skin and hair. They move from host to host through direct contact. They are more common in the colder months, and their numbers dwindle during the summer.

Cat lice have claws on their legs that help them cling to the hair. The females glue their eggs to the host’s hair close to the skin, and regular shampooing will not remove the eggs. It takes roughly 3 to 4 weeks for eggs to mature into adults.

Signs

Your cat might not seem too agitated if they have lice. Because of this, it can sometimes be hard to diagnose the problem on your own. A heavy lice infestation could make your cat look scruffy and unkempt. They might also experience excessive scratching that leads to raw and bald patches. You might notice small white dots, or eggs, on the fur.

Treatment

You will not be able to treat cat lice with home remedies or store-bought solutions. Getting rid of cat lice requires a trip to the vet for prescription topical preventions that are effective at killing lice. Don’t forget that you will need to wash all soft objects in hot water to kill any eggs lingering around the house. Fortunately, with the widespread use of monthly flea-and-tick preventions, lice infestations are now fairly rare in cats and dogs.

divider cat paw scratch oct 2024

Fleas Overview

Fleas are small, wingless insects. They feed on animal blood and aside from being a nuisance, can transmit diseases and cause allergies and anemia. There are over 2,200 flea species around the world. The two most common types are the cat flea (Ctenocephalides felis) and the dog flea (Ctenocephalides canis).

Cat fleas start reproducing roughly 1 to 2 days after a blood meal. Once they’ve found a host, the females lay eggs while feeding on the surface of the cat’s skin. A single female flea can produce 50 eggs per day, or 2,000 in her lifetime.

Flea eggs are oval-shaped with a pearly white color. The eggs often drop onto bedding or carpeting and hatch within 1 to 6 days. Freshly hatched flea larvae are free-moving and feed on organic debris in their environment until they are fully developed and can find a host.

Signs

It can be a little hard to tell if your cat has fleas or not. Here are some of the most common signs that your cat has fleas:

  • Increased scratching
  • Bald spots or hair loss
  • Skin irritation
  • Excessive grooming
  • Lethargy
  • Pale gums
  • Black specks in cat’s fur or bedding

Treatment

There are various ways to treat cats for fleas. Your vet will either give you a topical or internal application. Here are the most common types:

  • Flea powders
  • Flea sprays
  • Flea collars
  • Topical flea treatments
  • Oral flea medication

That said, the most effective flea preventions and treatments are ones prescribed by your vet versus those available over the counter.

divider cat paw scratch oct 2024

What Are the Differences Between Cat Lice and Fleas?

The biggest difference between cat lice and fleas is that lice burrow into parts of the body, while fleas are mainly on the surface. Fleas are able to jump higher and are much quicker than lice. Lice bites are much less painful than flea bites.

Lice and fleas are both small, wingless insects that consume blood from their hosts. Lice mainly live on hairy parts of the body, and fleas tend to stay in areas of warmth, like armpits and ears.

Fleas are larger than lice and have a much longer lifespan. While they are both oval-shaped, a flea has a flatter body and is a dark reddish-brown color rather than a gray color.

vet holding magnifying glass searching cat fleas over a grey and orange cat
Image Credit: lev.studio, Shutterstock

divider cat paw scratch oct 2024

Final Thoughts

Trying to tell the difference between two tiny insects can be a challenge. But in the end, both cat lice and fleas can cause discomfort or be dangerous to your cat. Even if you can’t tell the difference between the two, you need to take your pet to the vet so they can get treated with proper medicines or ointments. The sooner you fix the problem, the sooner your feline friend will be back to feeling and looking their best.

See also:


Featured Image Credit: Left wimala namket, Shutterstock | Right – KanphotoSS, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.




How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

4 Responses

    1. You are welcome. You might find this post helpful: https://www.catster.com/cat-health-care/best-flea-treatments/

  1. Good learning curve for me, thank you but still not sure if my cat has fleas or lice?
    Guess the same expensive treatment?
    Thanks, Alan.

    1. Hi Alan, a vet can help you identify them, and they can also recommend a treatment, as not every medicine covers both parasites.

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.


Catster's Digital Magazine is Back!

Vet-approved health & behavior advice

Real cat stories & community features

Chatting About the Importance of Spaying/Neutering, Cat Retail Shopping Ban & Red-Level Storms | Chatty Cattys, Episode 30

In this episode of Catster’s Chatty Cattys podcast, Nicole and Dr. Karyn are celebrating a major legal win for pets before diving into...

Is Your Cat Happy? Here’s How You Can Tell

Cats have a reputation for being indifferent, even inscrutable. But despite their seemingly ambivalent appearance, cats experience many emotions, including happiness, and they...

Human Brains Age Like Cats – New Study Debunks the 7-Year Rule

If you’ve ever caught your senior cat staring blankly at a wall, wandering the halls at 3 am, calling out for no clear...

Chatting with Devin About Here! Have a Kitten, Fostering, & Why Two Are Better Than One | Chatty Cattys, Episode 29

In this episode of Catster’s Chatty Cattys podcast, Nicole & Dr. Karyn sit down with Devin, the founder and one-woman show behind “Here...

More related

8 Cat Breeds That Get Stolen Most Often (With Info & Pictures)

Cats are becoming increasingly popular pets. While there are many great things about the rise in the popularity of cats, an unfortunate side...

Nature’s Variety Instinct Cat Food Review of 2026: Recalls, Pros & Cons

Review Summary Nature’s Variety is the brand behind Instinct cat foods, available as wet canned food, dry kibble, and toppers. Its inspiration is...

Can Cats Eat Tomato Sauce? Vet-Reviewed Nutrition & Safety Guide

It’s dinner time, and you’re serving up your signature dish of spaghetti with jarred tomato sauce because who has time to make tomato...

What Is the Cost to Remove a Cat Tooth? 2026 Price Guide

Part of caring for a pet cat is ensuring their dental health is monitored and managed as time goes on. Your veterinarian likely...

Keep reading

How to Tell If a Nursing Cat Is Pregnant Again? 7 Vet Reviewed Signs to Look For

Felines are extremely fertile animals, with females able to experience heats every 2–3 weeks during the breeding season1. That adds up to multiple opportunities for your cat to get pregnant! What if your cat just had kittens, though; surely, she...

pregnant cat on the ground

Why Do Cats Hate Water? 5 Vet-Verified Possible Reasons

If you’ve ever tried to give your feline friend a bath, you might already know that your cat is not a fan of water. Most domestic cats don’t appreciate getting wet at all. It’s true that some breeds of domestic...

Persian cat bathing

5 Homemade Cat Ice Cream Recipes (Vet-Approved)

Ice cream and popsicles are more than just a rich treat for humans on a hot day – you might be surprised to learn that our cats also love a good catsicle or pate infused fro-yo on occasion. Here we...

Homemade Cat Ice Cream Recipes

How to Give Your Cat CBD Oil: 5 Vet-Verified Ways That Work

When you think about everything a good cat owner should do for their pet, taking care of their health is at the top of the list. You want to ensure that your feline is fed high-quality food, has plenty of...

giving cat cbd oil

My Cat Won’t Eat: Causes, Feeding Recomendations & When To Worry (Vet-Verified)

Cats are pretty good at hiding it when they aren’t feeling well, and a sudden lack of interest in eating is a cause for concern. Cats can go off their food for many reasons, from stress to dental pain and...

Tabby cat eating food from white bowl

How Long Do Cats Live? Feline Lifespan Facts Explained (Vet Approved)

We’ve all heard that cats have nine lives. But how much of that is actually true? Do cats seem to escape brushes with death regularly? If the cat lives an expected average of years, how long is that usually? According...

Silver Tabby Norwegian Forest Cat

Can My Cat Breastfeed After Being Spayed? Vet-Verified Facts & FAQ

If you participate in a trap-neuter-return program for stray and feral female cats or you currently own a nursing cat, you may have thought about having her spayed. The process is crucial for stray and feral cats to prevent multiple...

Gray mother cat feeding kittens while taking a nap

Can Cats Drink Alcohol? Vet-Verified Facts, Risks & Safety Tips

For some people, there is no better way to de-stress and wind down from a long and busy day than kicking back with your favorite glass of wine, beer, or spirit. You may notice your curious cat sniffing around your...

Can Cats Drink Alcohol

Love Cats? So Do We! Join the Catster Community

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.




Sign up for the Catster Email Newsletter

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.