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?

Quick answer

Persistent itching usually means **[flea allergy](/glossary/flea-allergy-dermatitis), 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.

The full picture

Causes, home monitoring, treatment options and the exact signs that mean call your vet — in the complete guide.

Read the full guide Check symptoms

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.

Reviewed 2026-07-19 against UK veterinary guidance · Information only — not a substitute for seeing your vet.