What are the most common signs of allergies in dogs?

Itchy skin — especially paws, belly, ears, and face — recurrent ear infections, licking paws, hair loss, and red or inflamed skin are typical. Some dogs also have digestive signs with food allergies.

Can fleas cause itching even if I cannot see them?

Yes. Flea allergy dermatitis can cause intense itch from a single bite. Year-round flea prevention is essential — fleas are easy to miss on dark-coated dogs.

How do vets diagnose food allergies in dogs?

An elimination diet trial — feeding a novel or hydrolysed protein for eight to twelve weeks with no other food or treats — is the most reliable method.

When should I see a vet for itching?

Book an appointment if itching disrupts sleep, causes broken skin or infection, persists despite flea treatment, or is paired with ear discharge or hair loss.

Dog Health

Why Is My Dog Itching UK?

Published 19 July 2026Last updated 19 July 20262 min read

Quick answer

Persistent itching usually means flea allergy, environmental allergens, or food proteins — not just "dry skin." Year-round flea prevention is the first step. If itching continues, your vet can identify triggers and prescribe effective anti-itch treatment rather than endless bathing or random diet changes.

Key takeaways

Itchy skin — especially paws, belly, ears, and face — recurrent ear infections, licking paws, hair loss, and red or inflamed skin are typical. Some dogs also have digestive signs with food allergies.
Yes. Flea allergy dermatitis can cause intense itch from a single bite. Year-round flea prevention is essential — fleas are easy to miss on dark-coated dogs.
An elimination diet trial — feeding a novel or hydrolysed protein for eight to twelve weeks with no other food or treats — is the most reliable method.

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Three main causes

Flea allergy dermatitis

Even one flea bite can trigger intense itching in sensitised dogs. Use year-round flea prevention on all pets in the household — skipping months allows reinfestation.

Environmental allergies (atopic dermatitis)

Pollen, house dust mites, and mould cause seasonal or year-round itch — especially paws, belly, ears, and face. Management combines allergen reduction, regular bathing, and prescription medications.

Food allergies

Protein sources in the diet trigger itch and sometimes digestive signs. An elimination diet trial under vet guidance is the only reliable diagnostic method.

Other causes of itch

Ear infections — head shaking, smelly ears, pawing at ears
Mange (mites) — especially in puppies or immunocompromised dogs
Contact irritation — new bedding, floor cleaners, or plants
Yeast or bacterial skin infection — secondary to underlying allergy

What helps at home

Consistent flea treatment on all household pets
Regular grooming to spot hot spots early
Avoid frequent bathing with harsh shampoos — this can worsen dry skin
Do not give human antihistamines without vet dose confirmation

When to call your vet

Book an appointment if itching affects quality of life, causes broken skin, or persists despite flea control. Recurrent ear infections almost always need investigation for underlying allergy.

Affiliate links · Advertising

Coat and skin kit owners look for

These are Amazon searches, not recommendations — grooming basics for itchy pets; your vet should find the cause of the itch.

These links open Amazon searches for a general category of item — they are not recommendations of a particular product or brand. Links are marked * because if you buy something after following one we may receive a small commission at no extra cost to you. We have not tested these items, and we cannot see prices or reviews from here. Nobody pays to appear in this section. How we make money

Hypoallergenic pet shampoo
A mild, fragrance-free wash for sensitive skin — but see your vet first to find out why your pet is itchy.
Search on Amazon*
Opens amazon.co.uk in a new tab
Pet grooming wipes
Handy for wiping paws and coats after walks to lift off pollen and dust.
Search on Amazon*
Opens amazon.co.uk in a new tab
Fine-toothed comb
Parts the coat so you can look at the skin underneath — useful detail to describe to your vet.
Search on Amazon*
Opens amazon.co.uk in a new tab

As an Amazon Associate I earn from qualifying purchases. PETHEALTH+ is a participant in the Amazon EU Associates Programme, an affiliate advertising programme designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.co.uk.

Sources & further reading

Facts in this guide are rewritten in plain English from publicly available UK advice. We name the organisation where a specific point comes from their guidance. Links below go to the original pages — use them to read the source material directly.

PETHEALTH+ is independent. These organisations do not sponsor, approve, or partner with this website. Guidance checked against sources listed below (last updated 2026-07-19).

Frequently Asked Questions

What are the most common signs of allergies in dogs?: Itchy skin — especially paws, belly, ears, and face — recurrent ear infections, licking paws, hair loss, and red or inflamed skin are typical. Some dogs also have digestive signs with food allergies.
Can fleas cause itching even if I cannot see them?: Yes. Flea allergy dermatitis can cause intense itch from a single bite. Year-round flea prevention is essential — fleas are easy to miss on dark-coated dogs.
How do vets diagnose food allergies in dogs?: An elimination diet trial — feeding a novel or hydrolysed protein for eight to twelve weeks with no other food or treats — is the most reliable method.
When should I see a vet for itching?: Book an appointment if itching disrupts sleep, causes broken skin or infection, persists despite flea treatment, or is paired with ear discharge or hair loss.