Itchy Skin in Dogs: Causes and How to Help

Common Causes of Itchy Skin in Dogs

• Fleas and flea allergy: a few bites can cause intense itching in an allergic dog.¹⁴ See fleas on dogs.
• Environmental allergies (atopic dermatitis) and food allergies.^2,15 See dog allergies.
• Mites: sarcoptic mange (scabies) is intensely itchy and contagious.^10,3 See scabies in dogs.
• Bacterial and yeast infections, which can keep a dog itching even after the original cause is gone.^2,6 See yeast infections on dogs' skin.
• Less common causes include contact allergy, lice, and dry or scaly skin conditions.^10,4

What the Location of the Itch Can Tell You

• Lower back, tail base and back of the thighs: typical of flea allergy.¹⁴
• Paws, face, ears, armpits and belly: typical of environmental or food allergy.^15,16
• Ear edges, elbows, hocks and belly: typical of scabies.^10,3
• Belly, groin and paws touching the ground: possible contact allergy.¹⁰

These patterns overlap, so they're clues rather than a diagnosis.

When to See a Vet

See your vet if the itch lasts more than a week or two, keeps coming back, causes sores or hair loss, or is affecting your dog's sleep. Persistent itching is uncomfortable, and scratching often leads to skin infections that make it worse.²

How Vets Find the Cause

1. Check for parasites: flea combing, skin scrapings for mites, and often a trial of flea or mite treatment, since parasites can be missed.^4,14,10
2. Look for infection: tape or swab samples of the skin examined under the microscope for bacteria and yeast.^4,6
3. Test for food allergy with a strict elimination diet of at least 8 weeks.^17,4
4. Diagnose environmental allergy once other causes are ruled out.⁴

Treatment

Treatment depends on the cause: flea control for all pets in the home, mite treatment, medicated shampoos or medicines for infections, and diet or allergy medicines for allergies.^2,14,13 Fast-acting itch medicines such as Apoquel and Cytopoint can give relief while the cause is found, but they don't replace treating it.¹⁵ Clearing a flea infestation from a home can take up to 3 months.¹⁴

Home Care for an Itchy Dog

• Use year-round flea control on every pet in the household.¹⁴
• Bathe regularly with a gentle or medicated shampoo your vet recommends; bathing gives short-term itch relief and washes allergens off the coat.^13,15
• Prevent self-trauma with a cone or soft shirt if your dog is breaking the skin.⁵
• Track the itch on a 0 to 10 scale and note where and when it happens, to share with your vet.¹²
• Be cautious with home remedies: antihistamines and fish oil help only a minority of dogs.^13,2 Never put concentrated essential oils such as tea tree oil on your dog; they're absorbed through the skin and can be toxic.¹⁸

Frequently Asked Questions

Why is my dog so itchy but has no fleas?

Flea allergy is still possible, since a few bites are enough. Other common causes are allergies, mites and skin infections.

What can I give my dog for itchy skin?

Ask your vet first. Effective options depend on the cause and include flea control, medicated shampoos and prescription itch medicines.

Why does my dog keep licking its paws?

Often because of allergies, but also yeast infection, injury, or anxiety.

When should I worry about my dog scratching?

If it lasts more than a week or two, breaks the skin, causes hair loss or affects sleep.

Does Benadryl help itchy dogs?

Only a minority of dogs. Ask your vet before giving any human medicine.

Can food cause itchy skin in dogs?

Yes. Food allergy is part of the problem in 9% to 40% of itchy dogs.

Is my dog's itchy skin contagious?

Usually not, but scabies mites and ringworm can spread to other pets and people.

How do vets find the cause of itching?

By checking for parasites, then infections, then running a diet trial before diagnosing environmental allergy.