Excessive Shedding in Dogs: Medical Causes

By Tailwisp Editorial TeamUpdated October 17, 20263 min read

A little hair on the sofa is a fact of life with dogs, but a change in how much your dog sheds can tell you something about health.

What normal shedding looks like

Most dogs shed year-round, with seasonal peaks in spring and autumn, particularly double-coated breeds. See why do dogs shed and how much is normal. A healthy coat is shiny, with even coverage and no bald spots.

Signs that shedding is a health issue

• Sudden increase with no season change
• Patchy or symmetrical hair loss
• Bald spots
• Itching, scratching or licking. See dog itching and scratching
• Red, flaky or greasy skin
• Dull, brittle coat
• Weight change or lethargy

See dog hair loss causes.

Medical causes

• Allergies: environmental, food or flea allergy. See dog skin allergies and dog flea allergy dermatitis
• Parasites: fleas and mites. See mange in dogs and fleas on dogs
• Infections: bacterial or fungal. See pyoderma in dogs and ringworm in dogs
• Hormones: hypothyroidism and Cushing's. See hypothyroidism in dogs and Cushing's disease in dogs
• Nutritional problems: low-quality diets, protein or fat deficiency
• Stress: moves, boarding or illness may cause temporary shedding
• Medications and illness
• Pregnancy and nursing: a heavy shed after puppies
• Age-related coat thinning

What your vet may do

Your vet will examine the skin and coat, ask about diet, parasite prevention and history and may recommend skin scrapes, cytology, fungal tests, bloodwork and thyroid or adrenal testing. See dog bloodwork explained.

Treatment

Treatment depends on the cause, such as parasite control, medicated shampoos, allergy management, hormone medication or diet change. Do not start treatments without a diagnosis.

Coat care at home

1. Brush regularly with a suitable tool. See how to reduce dog shedding at home
2. Use deshedding tools gently. See best deshedding tools for dogs
3. Bathe with a suitable shampoo as advised.
4. Feed a complete diet and discuss omega-3 supplements.
5. Keep up parasite prevention.
6. Limit stress.

Seasonal blowouts

During coat blows, daily brushing helps. See dog blowing coat: what to do.

Shaving

Shaving double coats can harm regrowth and protection. See should you shave a double-coated dog.

Tracking changes

Take monthly photos and note shedding volume, itchiness and diet changes. This helps your vet.

Questions to ask your vet

Ask whether the shedding is normal, which tests are needed and what care to follow.

Common mistakes

• Shaving to stop shedding
• Switching foods constantly
• Ignoring itching
• Skipping parasite control

Troubleshooting

• My dog sheds more after moving: stress may play a role, so monitor.
• Bald patches appeared: book an exam.
• His coat looks dull: review diet and health.

A simple plan

1. Brush regularly.
2. Feed well.
3. Prevent parasites.
4. Check with a vet if things change.

Real-life examples

A terrier's shedding stops after thyroid treatment. A retriever's flea allergy is controlled with prevention. A husky's seasonal shed is managed with brushing. Diagnosis helps.

Know your dog's normal

Familiarity helps you spot change.

When to book a visit

Make an appointment if shedding changes suddenly, you see bald spots, the skin is red or flaky, or your dog is scratching more than usual. Bring photos and a list of diet, treats, shampoos and parasite products used in the last few months. A clear history often shortens the path to a diagnosis.

Nutrition checks

Compare your dog's food with a complete and balanced standard, and avoid frequent switching. Ask your vet before adding fish oil or other supplements, since dose and quality matter.

The takeaway

Normal shedding is fine, but sudden, patchy or itchy hair loss deserves a vet check.

This article is general educational information, not veterinary advice. Every dog is different. If your dog is unwell, or you are unsure about a symptom, diet change or medication, contact your veterinarian.