Why Is My Dog Always Scratching? Common Causes of Itchy Skin | AcuPet

Frequent scratching in dogs is usually a sign of an underlying skin problem. Common causes include fleas and other parasites, allergies, skin or ear infections, and irritation from products or the environment. Persistent itching should be assessed by a veterinarian because several causes can occur at the same time.

Why Is My Dog Scratching So Much?

Dog itching is called pruritus. It is a clinical sign, not a diagnosis. A dog may scratch, lick, chew, bite, rub, or shake its head because the skin or ears are irritated. The main causes veterinarians look for are parasites, infections, allergic skin disease, and other sources of irritation.

Common Causes of Itching in Dogs

1. Fleas and Other Parasites

Fleas can cause itching even when you do not see many fleas on the dog. Some dogs develop flea allergy dermatitis, an allergic reaction to proteins in flea saliva. Flea-related itching often affects the lower back, base of the tail, and thighs, and may cause redness, scabs, hair loss, or skin infection.

Other parasites, including mites, can also cause intense itching. A veterinarian may need to examine the skin or perform skin scrapings to identify some mites.

Possible signs include:

·        Frequent scratching, licking, chewing, or biting of the skin

·        Red bumps, scabs, or hair loss

·        Itching around the lower back, tail base, or thighs

·        Flea dirt or visible fleas, although fleas may be difficult to find

2. Environmental Allergies

Dogs can develop allergic skin disease in response to environmental allergens such as pollen, grass, mold, or dust mites. Itching may be seasonal or occur throughout the year.

Common signs include:

·        Licking or chewing the paws

·        Rubbing the face

·        Itchy or inflamed skin

·        Repeated ear problems

·        Redness or hair loss caused by scratching or licking

3. Food Allergy

Food allergy can cause itchy skin in dogs, but it cannot be diagnosed from itching alone. Food allergy can resemble environmental allergy and may occur with gastrointestinal signs such as vomiting or diarrhea.

If a food allergy is suspected, a veterinarian may recommend a strict elimination diet trial followed by a controlled food challenge. Changing food randomly is not a reliable way to confirm a food allergy.

4. Skin or Ear Infection

Bacterial or yeast infections can cause or worsen itching. They may develop as a secondary problem after allergies, parasites, or skin damage from repeated scratching and licking.

Signs that may occur with infection include:

·        Bad or unusual skin or ear odour

·        Red or inflamed skin

·        Scabs, crusts, or scaling

·        Fluid or discharge

·        Hair loss

·        Pain or increased sensitivity

·        Head shaking or ear scratching when the ears are affected

5. Skin Irritation

Contact with irritating products or substances can cause skin irritation. Examples include some shampoos, soaps, perfumes, cleaning products, or materials that contact the skin. Bathing too often or using products not made for dogs can also irritate the skin.

Use shampoo formulated for dogs and follow veterinary advice if your dog needs frequent or medicated bathing.

Why Does My Dog Keep Licking Its Paws?

Frequent paw licking can be caused by allergies, parasites, irritation, or infection. Allergic dogs commonly lick or chew their paws, but paw licking alone cannot identify the cause. Redness, swelling, odour, discharge, or pain makes a veterinary examination more important.

Why Does My Dog Scratch Its Ears or Shake Its Head?

Ear scratching and head shaking can occur with otitis externa, an inflammation of the external ear canal. Possible causes include allergies, parasites, foreign material, bacteria, and yeast. Foul odour, redness, swelling, discharge, or pain should be checked by a veterinarian.

When Should You Take Your Dog to the Vet?

What Can You Do at Home While Waiting for a Vet Visit?

·        Check the coat and skin for fleas, flea dirt, redness, scabs, or areas your dog keeps licking or chewing.

·        Keep bedding clean and follow an appropriate flea and parasite prevention plan recommended by your veterinarian.

·        Use only shampoos formulated for dogs. Avoid human shampoo and avoid bathing more often than needed unless your veterinarian recommends it.

·        Record when the itching started, where your dog itches, whether it is seasonal, and any recent changes to food, treats, grooming products, medication, or environment.

·        Take photos of visible skin changes to help track whether the problem is getting better or worse.

·        Do not give human anti-itch or allergy medicine unless your veterinarian confirms that the medicine is appropriate and provides the correct dose.

How Do Veterinarians Find the Cause of Itching?

A veterinarian will usually start with your dog's history and a physical examination of the skin and ears. Depending on the findings, testing may include flea combing, skin scrapings, skin cytology, ear cytology, or other tests. If parasites and infections are not responsible, the veterinarian may investigate allergic skin disease and consider a diet trial when food allergy is suspected.

Frequently Asked Questions

Is it normal for a dog to scratch every day?

Occasional scratching is normal. Frequent, persistent, or intense scratching can indicate an underlying problem, especially when it is accompanied by redness, hair loss, sores, odour, ear problems, or discomfort.

Can food allergies make dogs itchy?

Yes. Food allergy can cause itchy skin, but itching alone does not prove that food is the cause. A veterinarian may use a strict elimination diet trial and food challenge to investigate suspected food allergy.

Why does my dog keep licking its paws?

Common causes include allergies, parasites, irritation, and infection. Paw licking that is frequent or accompanied by redness, swelling, odour, discharge, or pain should be assessed by a veterinarian.

Can fleas cause severe itching even if I cannot see fleas?

Yes. Dogs with flea allergy dermatitis can develop intense itching from flea bites, and fleas may be difficult to find because dogs can remove them through grooming.

Can bathing make my dog's itching worse?

Yes. Bathing too often or using an unsuitable shampoo can irritate the skin. Use a shampoo made for dogs and follow veterinary advice if frequent or medicated bathing is needed.

Should I give my dog human allergy or anti-itch medicine?

Do not give human medication without veterinary advice. Some medicines may be used in dogs, but the appropriate medicine and dose depend on the individual dog and the cause of the itching.

Key Takeaway

If your dog is always scratching, do not assume the cause is simply dry skin or food allergy. Fleas and other parasites, allergies, infections, ear disease, and skin irritation can all cause itching, and more than one problem may be present. Persistent or severe itching should be evaluated by a veterinarian so the underlying cause can be identified and treated.