How do dogs get fleas?

Wondering how dogs get fleas? Read on to learn the common ways this happens, as well as all you need to know on the flea life cycle.

Overview

Fleas are the most common parasite affecting dogs in the UK. They thrive in warm, humid places — including our homes. Dogs can get fleas from other pets, wildlife, or even from us if we bring them indoors on our clothing or belongings. Once they are on your dog, fleas bite, feed, and lay eggs. They quickly multiply, and in the meanwhile cause your dog nasty itching, scratching, hair loss, and sometimes more serious conditions. In this guide, we’ll explain how dogs get fleas, how to spot the signs, and what to do to treat and prevent them.

The usual way dogs get fleas

Flea life cycle

Spotting the signs: symptoms of fleas in dogs

Treating dogs for fleas

Flea treatment for home

My dog keeps getting fleas even after treatment — help!

Medically reviewed by Lizzie Youens BSc(Hons) BVSc MRCVS

Published on 08/06/2025 • Reviewed on 08/06/2025