Fleas and dogs: what should I do?

Caution. Fleas cause itching and skin problems, can pass on tapeworms, and can cause anemia in young, old or sick dogs. Check for flea dirt around the back end and above the base of the tail.

Caution

Fleas and dogs: what to do

Caution. Fleas cause itching and skin problems, can pass on tapeworms, and can cause anemia in young, old or sick dogs.

What to do now

Check for flea dirt around the back end and above the base of the tail.
Call your vet for advice on an effective flea treatment.
Treat all pets in the home at the same time.
Vacuum often and wash bedding on a hot wash.

Don't

Don't rely on flea shampoos or untested collars to clear fleas.
Don't use dog flea or tick products on cats. Many contain permethrin or similar insecticides that can kill cats; use only products made for cats.

Signs to watch for

Scratching or nibbling at the back end
Flea dirt (black specks), often on the lower back
Bald patches or rough fur
Sore, itchy skin
Anemia (low red blood cells) in young, old or sick dogs

Why

Fleas feed on blood, and most of them live in the home rather than on the dog. Some dogs are allergic to flea bites.

Sources

Guide reviewed 9 October 2026.

General information from the sources above, not a diagnosis. When in doubt, call your vet.