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.

If you need to speak with a vet but can't get to one, head over to PangoVet. It's an online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

Preventative wellness PGV mention keep cat healthy Preventative wellness PGV mention keep cat healthy mobile

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.


Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

The Cat Biting Mistakes Most Owners Make (And What Works Instead)

Cat bites sent more than 400,000 people to emergency rooms in the US each year.1 Not scratches. Bites. And the reason they’re so...

Do Cats Cause Schizophrenia? Scientists Find a Link – Here’s What It Means

Being a fierce advocate (and occasional recipient of) mental health support and awareness, the term ‘crazy’ is not one I like to fling...

One in 100 Cats Gets Diabetes – Here’s How to Catch It Early

One in every 100 cats develops diabetes.1 That’s not a rare, unlucky condition reserved for cats with obvious health problems. It’s common enough...

Dramatic Rescue Turns Into Dramatic Reunion

What started as a routine call for the RSPCA became a heroic, five-hour rescue featuring one trapped and traumatized cat, an emotional family...

More related

How to Stop a Cat From Licking Everything: Our Vet Discusses Reasons, Remedies & FAQ

You know that cats groom themselves, so you’re not surprised to see your kitty licking until you realize they’re constantly licking things. Is...

7 Best Cat Trees for Small Apartments in 2026 – Reviews & Top Picks

Many cats love the excitement and coziness of a cat tree. Cats will leap, run, scratch, and snooze in their favorite cat condo....

9 Best Dematting Tools for Cats in 2026 – Reviews & Top Picks

Keeping your feline healthy and happy is your top priority, but are you brushing your cat’s hair every week? Cat owners often disregard...

What Causes Abnormal Eye Color in Cats? 3 Vet-Reviewed Factors

Cats are known for having the most beautiful eyes among animals. Given their striking eye colors, have you ever wondered what causes a...

Keep reading

Can Kittens Eat Adult Cat Food? Vet-Approved Timeline & Transition

If you have a multi-cat home, you may encounter your new kitten lapping up some of your adult cat’s food, or perhaps you accidentally picked up adult cat food instead of kitten food and only realized once the bowl was...

Can Kittens Eat Adult Cat Food

Can Cats Eat Hazelnuts? Vet Approved Nutritional Facts & FAQ

Hazelnuts are a great addition to our human diet for being a source of healthy fat that is loaded with nutrients and antioxidants. Whether you are snacking on a handful of hazelnuts or are enjoying the delicious forms of hazelnut...

Can Cats Eat Hazelnuts

Heartworm in Cats (Vet Reviewed Signs & Care FAQs)

Heartworms in cats are similar to those in dogs. However, they are difficult, if not impossible, to treat, and the best way to keep your cat healthy is to work with your vet to prevent them. Because heartworms can harm...

Sick cat in animal hospital

How to Keep Your Cat’s Nails Healthy in 5 Vet-Approved Steps

As a responsible cat owner, you’re well aware of the importance of caring for your kitty’s sharp little claws—not only for their health but also to spare your furniture! While our feline companions know how to keep their fur in...

cat paws when sitting on the table

How to Stop a Cat From Moving Her Kittens: 5 Vet-Approved Tips to Try

Knowing that your cat is having a litter of cute kittens can be exciting, but after they’re born, there’s so much to keep an eye on as a cat owner. If you’ve noticed your cat is moving her kittens, you...

Mother cat running with newborn kitten in her mouth

Transitioning Your Cat to Raw Food: 5 Crucial Tips

There are arguments for and against a raw food diet for cats. Some say that it can be dangerous due to the prospect of contaminated meat and a lack of nutrients. Others say that it can be beneficial because it’s...

cat reaching dish with raw meat

Why Is My Kitten So Hyper? 8 Vet-Reviewed Reasons for This Behavior

Kittens are easily among the most lovable animals on the planet. They are full of life and hilarious antics, and watching them learn how to act like cats can be great fun. But have you ever wondered whether your kitten...

2 Grey Striped Kittens Playing on a Blanket with Toy

How to Help Your Cat Pass a Hairball: 6 Vet-Approved Tips & Tricks

Many cat owners think that hairballs are just a natural part of a cat’s life and that there’s nothing that can be done about them.1 You may be surprised to learn that cats throwing up hairballs isn’t actually normal. While...

Yawning, choking, coughing Cat close up

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.