What are Fleas?

The Mobile Dog Groomers Norwich - dog and flea cartoon illustration

Fleas are small, black blood-sucking insects that measure l-3mm in length and are one of the most common parasites found on dogs. In fact, nearly all dogs will suffer from a flea infestation at some point in their lives.

The lifespan of a flea is a few months. Adult fleas are found in the dogs coat where they suck blood. The female fleas lay up to 50 eggs per day which are non-sticky and drop onto the floor, soft furnishings and bedding, as the dog wanders round the house. After a few days, the larvae hatch out and produce pupae (cocoons) which house the developing flea. The fleas that you may see on your dog are only the tip of the iceberg – 95% of the problem exists as eggs, larvae and pupae in the home. When fleas are fully grown they wait until a suitable host such as a dog or cat is nearby and emerge from the cocoon before jumping onto the host.

How can I tell if my dog has fleas?

The symptoms can vary from no visible signs to severe itching. This may involve scratching or commonly chewing the lower back or tail-base. Close inspection can reveal either small black insects or the small black flea faeces. Flea faeces can be identified by brushing your pets coat with a fine-toothed flea comb and placing the debris you collect on a wet piece of white paper. Flea faeces will dissolve in the water to produce brown / red swirls on the paper.

If the infestation is very severe, it can result in severe blood loss causing anaemia – it can even kill a puppy. In allergic pets affected with Flea Allergic Dermatitis (FAD) the itching and self-inflicted trauma that results from flea bites may be particularly severe.


A variety of products including collars, oral, spray and spot-on treatments are available to help treat dogs infested with fleas.

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