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Lice on Dogs

By the Dog Health Handbook team · Updated · Fact-checked against current veterinary references (see sources)

Key takeaways

  • Lice are host-specific: people can't catch dog lice, and dogs can't catch head lice.
  • Look for nits glued to the base of the hairs that don't shake off.
  • Many flea products also kill lice.
  • Treat every dog in the home and repeat as your vet directs.
  • Heavy infestations can cause anemia in puppies and small dogs.

Table of Contents

Research Signs Lice or fleas? Diagnosis Treatment Cleaning People FAQ Sources

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Lice on dogs are small, wingless insects that live their whole lives in a dog's coat. Dogs get three species: the chewing louse Trichodectes canis, the sucking louse Linognathus setosus and, mainly in tropical areas, the chewing louse Heterodoxus spiniger.1,2 Lice are "highly host-specific," so you can't catch lice from your dog and your dog can't catch head lice from you or your children.1,3,4 Signs include itching, a rough or matted coat, hair loss and tiny white or yellow eggs (nits) glued to the hairs.3,5,6 Lice are now rare in dogs on monthly flea and tick products and are mostly seen in very young, old, sick, stray or neglected dogs.2,3 Many flea products also kill lice. Treatment is often repeated after 7 to 10 days because most products don't kill the eggs, and every dog in the home needs treating.1,5

See your vet promptly if your dog has lice and:

  • Pale gums, weakness or low energy. Heavy sucking louse infestations can cause anemia, especially in puppies and small or weak dogs.1,3,7
  • Open sores, scabs or signs of skin infection from scratching5,6
  • Severe matting or widespread hair loss2,3

What the Research and Guidelines Say

  • Rare in protected dogs. The Merck Veterinary Manual says lice infestation is "rare in populations treated with monthly flea and tick preventatives."2
  • One dose cleared chewing lice. In a 2022 field study, a single isoxazoline-class oral chew left no living lice on any of 25 treated dogs by day 14.8
  • Sucking lice too. In a 2017 study, a single isoxazoline-class tablet eliminated sucking lice from treated dogs within 28 days.9
  • Uncommon in a recent survey. A 2023 study of 90 dogs in Egypt found chewing lice on 2 of them (2.2%).10

Signs of Lice on Dogs

  • Scratching, rubbing and biting at the skin1,6
  • A rough, dry or matted coat5,2
  • Hair loss, often around the ears, neck, shoulders, groin and rear end3
  • Small wounds from sucking lice that can become infected5
  • Adult lice visible to the naked eye, and nits glued to the hairs3,6

In long-haired dogs, lice can go unnoticed. You often need to part the hair to see lice and nits.2

Lice, Fleas, Walking Dandruff or Dandruff?

What you seeSpreads to people?
LiceSlow-moving adults; white or yellow nits glued to the base of hairs that don't fall off when shampooed3,6No1
FleasFast, jumping brown insects and flea dirt that turns red on a wet paper towel11Fleas bite people11
Cheyletiella mites ("walking dandruff")Moving white flakes, mostly along the back12Can cause an itchy skin rash12
DandruffLoose flakes that shake or brush offNo

The AKC suggests a simple check: flakes that shake off are probably dandruff, while specks that "cling stubbornly to the hair" are probably nits.3 See fleas on dogs, mites on dogs and dog dandruff.

How Vets Diagnose Lice

Diagnosis is usually made by finding lice or their eggs on your dog.5,1 Your vet may part the hair, use a fine comb or look at hairs and samples under a microscope. If the species is unclear, samples can be sent to a lab.2,6,13 Tell your vet which parasite products your dog uses and about recent boarding or travel.6

How to Get Rid of Lice on Dogs

  • Use a vet-recommended product. Many flea control products also kill lice, including isoxazoline-class oral chews and several spot-ons, collars and sprays.1,2,6
  • Repeat as directed. Most topical treatments and shampoos don't kill nits, so they're usually repeated after 7 to 10 days to catch newly hatched lice.5,1 Your vet will tell you whether and when to repeat.
  • Treat every dog in the home, even those without signs.5
  • Clip matted hair, which protects lice from treatment.2,3
  • Comb out nits with a fine-toothed comb. Combing helps but doesn't kill lice that have already hatched.5,3
  • Treat underlying problems, such as poor nutrition or other illness.2

Some dog lice products contain pyrethrins or pyrethroids, which can be dangerous for cats in the home, so ask your vet about any cats.2,14

Cleaning Your Home

Adult lice survive only 3 to 7 days off a dog, but eggs stuck to shed hair can keep hatching for 2 to 3 weeks.1,5 To stop reinfestation:3,14,2

  • Wash your dog's bedding, blankets and sweaters in hot water, above 60°C (140°F) if the fabric allows, or dry them on a hot dryer setting. Clean collars and leashes, or seal small items in a bag and freeze them overnight.
  • Clean or replace brushes and combs, and don't share grooming tools between dogs.
  • Keep your dog and its bedding away from other dogs for at least four weeks after treatment.

Can Humans Get Lice From Dogs?

No. The CDC says, "Animals do not get or spread head lice."4 Dog lice and human lice are different species, and each lives only on its own host.1,3 There's no need to treat your dog if a family member has head lice. Human lice shampoos aren't made for dogs, so use only a product labeled for dogs and your dog's weight.15,16 The chewing louse of dogs can carry the flea tapeworm, which occasionally infects children who swallow an infected insect.1,2,17

See also skin parasites on dogs, flea treatment for dogs and tapeworms in dogs.

Frequently Asked Questions

Can my dog get lice from my child?

No. Human head lice don't live on dogs, and dog lice don't live on people.

Are dog lice contagious to other dogs?

Yes, through close contact and shared bedding, brushes and collars.

What do lice on dogs look like?

Small, slow, flat insects you can see, plus white or yellow eggs glued to the base of the hairs.

How long do lice live off a dog?

Adults die within about a week, but eggs on bedding or shed hair can hatch for 2 to 3 weeks.

Can I use human lice shampoo on my dog?

No. Use a product labeled for dogs that your vet recommends.

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Sources and further reading

This article was rewritten and fact-checked on October 25, 2026 against current veterinary references and specialist guidelines:

  1. Companion Animal Parasite Council. Lice. CAPC Guidelines, updated March 2023.
  2. Ketzis JK. Lice in Dogs and Cats. Merck Veterinary Manual (professional version), reviewed May 2023, updated September 2024.
  3. AKC Staff. Lice on Dogs. American Kennel Club, updated March 10, 2026.
  4. Centers for Disease Control and Prevention. About Head Lice. CDC, June 4, 2024.
  5. Thomas JE. Lice of Dogs. Merck Veterinary Manual (pet owner version), reviewed June 2018, updated November 2025.
  6. Koehler R. Lice in Dogs. PetMD, March 18, 2026.
  7. Marks SL, BVSc, DACVIM. Anemia in Dogs. Merck Veterinary Manual (pet owner version), full review December 2017, last updated May 2026.
  8. Mihalca AD, Deak G, Panait LC, Rabei S, Beugnet F. Efficacy of an isoxazoline-class oral chew against natural infestations with Trichodectes canis in dogs under field conditions (title paraphrased). Parasites & Vectors, 2022.
  9. Kohler-Aanesen H, Saari S, Armstrong R, Pere K, Taenzler J, Zschiesche E, et al. Efficacy of an isoxazoline-class chewable tablet for treating naturally acquired Linognathus setosus infestations on dogs (title paraphrased). Parasites & Vectors, 2017.
  10. Zineldar HA, Abo-zeid NZ, Eisa MI, Bennour EM, El-neshwey WMI. Prevalence, clinical presentation, and therapeutic outcome of ectoparasitic infestations in dogs in Egypt. Open Veterinary Journal, 2023.
  11. Companion Animal Parasite Council. Fleas. CAPC Guidelines, updated September 2017.
  12. Companion Animal Parasite Council. Hairclasping Mite. CAPC Guidelines, updated July 2020.
  13. Mueller RS. Specific Tests in Small Animal Dermatology. In: Dermatology for the Small Animal Practitioner. Teton NewMedia, 2006 (IVIS).
  14. European Scientific Counsel Companion Animal Parasites. Control of Ectoparasites in Dogs and Cats. ESCCAP Guideline 03, 7th edition. ESCCAP, January 2022.
  15. US Environmental Protection Agency. Controlling Fleas and Ticks on Your Pet. EPA, updated June 2, 2025.
  16. US Food and Drug Administration. Safe Use of Flea and Tick Products in Pets. FDA Consumer Update, June 2021.
  17. Companion Animal Parasite Council. Dipylidium caninum. CAPC Guidelines.

About this article

Last updated : fully rewritten using Companion Animal Parasite Council and European parasite guidelines, the Merck Veterinary Manual, the CDC, the AKC and field studies published 2017 to 2023.

This page is for general information and is not a substitute for an exam by your veterinarian.