Fleas and Flea Allergy

Flea allergy dermatitis is one of the most common skin conditions in UK dogs. The problem isn't the flea itself — it's the flea's saliva. Some dogs are significantly more sensitive to it than others, and a single bite can trigger intense itching that lasts for days.

Even if you can't see fleas, that doesn't mean they're absent. Fleas move fast and hide well. Part the fur near the base of the tail and look for small dark specks. Collect a few and place them on damp white tissue: if they turn reddish-brown, that's flea dirt and your dog almost certainly has fleas.

Regular flea treatment, following your vet's advice, is the standard approach to controlling this.

Environmental Allergies (Atopic Dermatitis)

Some dogs develop allergies to things in their environment: grass, pollen, dust mites, or mould spores. This is called atopic dermatitis, and it's a well-recognised condition in veterinary medicine.

The itching often affects the paws, face, ears, belly, and armpits. It can be seasonal — worse in spring and summer when pollen counts are high — or year-round when the trigger is indoors, such as house dust mites.

Food Sensitivities

Certain foods can trigger skin reactions in some dogs. Common ingredients linked to sensitivities include beef, chicken, dairy, and wheat, though any ingredient could in theory be involved. Food-related itching tends to be year-round rather than seasonal and can appear anywhere on the body.

Identifying the trigger requires a proper elimination diet, guided by your vet. This takes several weeks and needs to be followed carefully to give reliable results. Random food switches on their own are rarely conclusive.

Skin Infections

Bacterial and yeast infections can cause itching, and they're often secondary — meaning they develop because the skin was already irritated or damaged. A dog scratching from allergies may break the skin barrier, making infection more likely.

Signs include redness, a musty or unpleasant smell, greasy or flaky patches, and thickened or discoloured skin. These infections need treatment, and the underlying cause usually needs identifying and addressing too.

Mites

Several types of mite affect dogs. Sarcoptic mange (caused by Sarcoptes scabiei) is highly contagious — to other dogs and to people — and causes intense itching, crust formation, and hair loss. Demodectic mange (caused by Demodex mites) tends to affect younger dogs or those with immune problems, producing patchy hair loss without necessarily causing severe itching.

Ear mites are more common in dogs that spend time around cats or in multi-pet households. Signs include head shaking, scratching at the ears, and dark discharge inside the ear canal. Mites need specific veterinary treatment; they won't clear up without it.

Dry Skin

Dogs can develop dry, flaky skin for several reasons: low indoor humidity (particularly in winter), bathing too frequently, using shampoos not designed for dogs, or a diet lacking enough essential fatty acids. Dry skin causes itching and can result in a dull or rough-looking coat.

This is often one of the simpler causes to address, but it's worth a vet check before assuming dry skin is the only issue — it can sometimes accompany or mask something else.

Contact Irritation

Some dogs react to things they come into physical contact with: certain plants, cleaning products used on floors, washing powders on their bedding, or synthetic fabrics. Redness and itching tend to appear in the areas that made direct contact, such as the belly, paws, or chin.

Ear Problems

Dogs that scratch repeatedly at their ears, shake their heads, or rub their faces against furniture may have an ear infection rather than a general skin issue. Ear infections can be bacterial or yeast-based, tend to produce a noticeable smell, and cause real discomfort. They need veterinary assessment and treatment.