Dog with itchy skin (chewing, licking, scratching)
Persistent itching deserves a vet appointment — fleas, allergies, and mites all need different treatments, and self-trauma escalates quickly into hot spots and infection.
Recognise the signs
- Persistent scratching, chewing, or licking
- Red, inflamed, or thickened skin
- Hair loss in patches
- Scabs, crusts, or moist hot spots
- Foul yeasty smell
- Behavioural changes — restlessness, loss of sleep
- Visible fleas or flea dirt (small black specks that turn red on damp paper)
First aid steps
- Comb thoroughly with a flea comb over white paper or a damp cloth — flea dirt confirms fleas.
- Photograph affected areas for the vet.
- Check ears, paws, armpits, belly, and tail base — common itchy hotspots.
- Note recent food, garden, household product changes.
- Phone the vet — a routine appointment within 1–2 weeks is appropriate for chronic itching; sooner for sudden severe itching or hot spots.
Do NOT
- Do not give human anti-itch creams (hydrocortisone, etc.) — most are unsafe if licked.
- Do not use over-the-counter flea treatments not designed for dogs (or not appropriate for the dog's weight).
- Do not assume the dog grows out of allergies — they typically progress.
- Do not bathe excessively with shampoo — strips natural oils unless using a vet-prescribed formulation.
When to phone the vet immediately
- Sudden severe itching with swelling — possible allergic reaction (see pet-allergic-reaction-acute)
- Hot, raw, weeping patches (hot spots) developing rapidly
- Self-trauma causing bleeding wounds
- Itching with lethargy, fever, or weight loss
- Spreading hair loss with crusts (suspect mange — contagious)
Signs that can usually wait for a routine appointment
- Mild occasional scratching in an otherwise normal dog can be monitored — most dogs scratch mildly at times. Persistent itching beyond a few days warrants vet review.
Common causes
- Fleas (still the commonest cause in UK pets)
- Atopic dermatitis (environmental allergies)
- Food allergy or intolerance
- Sarcoptic or demodectic mange
- Bacterial or yeast skin infection (often secondary to allergy)
- Contact dermatitis (cleaning products, plants)
- Lice (uncommon in well-cared-for dogs)
- Underlying endocrine disease (hypothyroidism, Cushing's)
What the vet will need to know
- How long itching has been happening
- Areas of body affected
- Flea/worm treatment history (and product name)
- Recent diet, environmental, or household product changes
- Other pets in household and whether affected
- Photos of the affected areas
- Previous skin diagnoses or treatments
Aftercare
- Treatment depends on cause — flea control, anti-itch medication, antibiotics for secondary infection, hypoallergenic diet trial.
- Allergy management is often lifelong with various combinations of medication and diet.
- Recheck visits to monitor.
- Treat all in-contact pets for parasites.
Prevention
- Year-round flea, tick, and worm prevention with vet-recommended products.
- Treat the home environment for fleas alongside pet treatment (vacuum, wash bedding hot).
- Investigate and manage allergies properly — guesswork wastes years.
- Avoid harsh household chemicals on flooring where the dog rests.
- Maintain healthy weight and skin with good diet.
Breed-specific notes
- Atopic-prone: West Highland White Terrier, Bulldog, French Bulldog, Labrador, Boxer, Shar Pei.
- Demodex-prone: short-coated young dogs, particularly Bulldogs, Boxers, Pugs.
Frequently asked questions
Why is flea control needed even if I never see fleas?
By the time you see fleas, populations are usually well established. Many itchy dogs have flea allergy with no visible fleas — the bites of even a small number trigger the reaction. Year-round prevention is the most reliable defence.
Will switching food cure my dog's itching?
Sometimes — if food allergy is the underlying cause. A proper hypoallergenic diet trial under vet supervision (8–12 weeks of strict elimination diet) is the only reliable test. Random food switches without method usually fail.
Can I use Piriton for itching?
Antihistamines help only a minority of itchy dogs. Vet-prescribed treatments (Apoquel, Cytopoint, steroids in selected cases) work far better for most allergic dogs. Piriton may be tried under vet direction at confirmed dog-safe doses, not from a person's prescription.