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Can Pets Get Lice From Humans? Can Cats and Dogs Get Head Lice?


One common concern among pet owners is the possibility of their beloved cats and dogs contracting lice from humans. Lice infestations can be distressing, and understanding the risks and realities of these tiny parasites is crucial for maintaining the health and well-being of both your family and your pets.

Can dogs get lice?

What are Lice?

Lice are small, wingless insects that live on the skin of various animals, including humans. They feed on skin debris or blood, depending on the species. The most common type in humans is the head louse, scientifically known as Pediculus humanus capitis. These are different from the lice that typically infest pets.

Lice in Humans vs. Pets

Human Lice

  • Specific to Humans: Human lice, including head lice, are species-specific and generally only live on humans. They thrive in human hair and feed on human blood.
  • Transmission: Human lice are typically spread through direct head-to-head contact or sharing of personal items like hats or hairbrushes.

Pet Lice

  • Species-Specific Varieties: Cats and dogs are affected by their species-specific lice, such as Trichodectes canis and Linognathus setosus for dogs.
  • Different Environments: These lice have adapted to live on the skin and fur of their respective animal hosts and have different life cycles and feeding habits compared to human lice.

Can Pets Get Lice from Humans?

Can cats get lice?

The Myth Debunked

  • Species-Specific Nature: Lice are species-specific, meaning the type of lice that live on humans cannot live on pets, and vice versa. Therefore, pets cannot contract head lice from humans.
  • No Cross-Infestation: Scientific studies, including those referenced in the Merck Veterinary Manual, confirm that human head lice cannot survive on pets and pets’ lice cannot thrive on human hosts.

Can Cats and Dogs Get Head Lice?

  • Head Lice Limitation: Cats and dogs cannot get head lice from humans. Their fur and skin environment are not suitable for human head lice.
  • Own Lice Types: They can, however, get their specific type of lice, which are entirely different from human head lice.

Prevention and Treatment

For Pets

  • Regular Grooming: Regularly groom your pets and watch for signs of lice, such as itching or visible nits (lice eggs).
  • Veterinarian Consultation: If you suspect a lice infestation, consult a veterinarian for proper diagnosis and treatment.

For Humans

  • Personal Hygiene: Maintain good personal hygiene and avoid sharing personal items like combs or hats.
  • Treatment Options: If head lice are found, there are various over-the-counter and prescription treatments available.


Understanding that lice are species-specific helps dispel the myth that pets can get lice from humans. While cats and dogs can get their own types of lice, these are different from human head lice. By maintaining proper hygiene and regular pet grooming, you can help ensure that your family and pets remain lice-free.

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