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Sticker of Dog louse
Bug card No. 0413 of 1,500

Dog louse

Trichodectes canis

The dog louse is a tiny, flat insect that lives its whole life in a dog's fur. It is less than 2 millimetres long and moves so slowly it can look like it is standing still. It holds on tight to the hairs with its special legs and jaws.

Lives in
All over the world, on pet dogs and on wild wolves, coyotes and foxes
Length
1.6 to 1.8 mm (0.06 to 0.07 in)
Top speed
about 0.42 km/h (0.26 mph)
On foot, estimate
Can it hurt you?
Harmless
It does not live on people or cats. It can make a dog very itchy, so a dog with lice should visit the vet.
What does it eat?
It scrapes the dog's skin with its jaws and eats tiny flakes of skin.
For real!Photo of Dog louse
Picture by Adam Cuerden. Public domain, via Wikimedia Commons.

How big is it?

How long is it?

Dog louse about 1.8 mm long (0.07 in)A grain of rice about 6 mm (0.24 in)
3 of them in a row are as long as one grain of ricecould run across a dinner table in 8.6 secondsmoves 65 times its own body length every second

How big is Dog louse compared to YOU?

Just maths in your browser. Nothing is saved or sent anywhere.

How fast is it?

cool stuff

Fun facts

1

The mother glues each egg to a single hair of the dog.

2

The eggs hatch after about five to eight days, and a baby louse grows up in three to five weeks.

3

It spends its whole life on the dog, from egg to grown-up.

4

In cold places like Scandinavia it is one of the most common dog pests, because ticks and fleas do not like the cold.

5

It likes to sit on the dog's back, neck and head best.

you asked

Most asked questions about Dog louse

?Can dog lice live on humans?

No. Dog lice stay on dogs and their wild cousins. They do not move to people or cats.

?How big is a dog louse?

Very small, less than 2 millimetres long, a little bigger than a grain of salt.

?How do dogs get lice?

From other dogs. Healthy, well cared for dogs rarely get them.

For bug experts

Scientific name
Trichodectes canis
Group
Other insects
Family
Trichodectidae
Classification
Insecta > Psocodea > Trichodectidae
Lives on
Europe, Asia, Africa, North America, South America, Australia and Oceania
Also known as
Canine chewing louse

Where the facts come from

  1. Trichodectes canis (Wikipedia, CC BY-SA 4.0): what it looks like, where it lives, what it eats, sizes and fun facts, retold in simple words.
  2. Picture by Adam Cuerden. Public domain, Wikimedia Commons. The round sticker of this bug is cut from the same picture.

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More from the same group: Other insects

Also at home here: Houses and farms