🐕 Hair Loss & Coat

Dog Hair Loss & Poor Coat Quality — Nutritional Causes & Solutions

Excessive shedding and a dull, thinning coat are often nutritional in origin. But some patterns signal underlying disease — knowing the difference matters.

1. Is It Nutrition or Disease?

Before changing diet, determine whether the hair loss is nutritional or disease-related. The patterns differ:

Likely Nutritional

✓Overall dullness and increased shedding (diffuse, not patchy)
✓Dry, flaky skin throughout the coat
✓Gradual onset over months
✓No other symptoms (normal energy, appetite, weight)

May Indicate Disease

!Patchy or symmetrical bald spots
!Skin changes: darkening, crusting, redness
!Accompanied by weight change, lethargy, or increased thirst
!Sudden onset

2. Nutritional Causes — Key Nutrients for Coat Health

Omega-3 / Omega-6 Imbalance

The ratio of omega-6 to omega-3 in most dry foods is 10:1 or higher, when the ideal is closer to 5:1. Excessive omega-6 promotes inflammation, weakening the skin barrier and increasing hair loss.

Protein Deficiency

Hair is ~95% keratin (protein). Insufficient protein or poor-quality protein (low digestibility) leads to dull, brittle coat and increased shedding.

Zinc Deficiency

Zinc is essential for cell division and keratin synthesis. Certain breeds (Siberian Husky, Malamute) have impaired zinc absorption and need higher intake. Signs: crusty skin around the mouth, nose, and eyes.

Biotin (Vitamin B7) Deficiency

Biotin supports fatty acid synthesis and healthy skin cell turnover. Chronic raw egg white feeding can deplete biotin (avidin in egg whites blocks absorption). Signs: dull coat, dry flaky skin.

Vitamin E Deficiency

Vitamin E is an antioxidant that protects cell membranes in skin and hair follicles. Deficiency causes skin inflammation and coat degradation.

3. Improving Coat Quality Through Diet

Upgrade Protein Quality

Choose a food with a named meat (chicken, salmon, beef) as the first ingredient, with meat content above 25%. Higher digestibility means better amino acid availability for keratin production.

Check Omega-3 Content

For coat support, aim for 0.5–1.5% omega-3 on a dry matter basis. Fish-based foods naturally contain EPA and DHA, which are more bioavailable than plant-source ALA. Omega-3 supplementation (fish oil) can help if the current food is low.

Ensure Zinc Adequacy

Most complete foods meet zinc requirements, but Nordic breeds (Husky, Malamute) may need zinc-enriched foods or supplementation. Avoid excessive calcium supplementation, which impairs zinc absorption.

Reduce Raw Egg White Feeding

Raw egg whites contain avidin, which blocks biotin absorption. Cooked eggs are fine. If feeding raw eggs, include the yolk — which contains biotin — to partially offset this.

4. Disease-Caused Hair Loss — Know When to See a Vet

Hypothyroidism

Bilateral symmetric hair loss, weight gain, lethargy, cold intolerance

Requires thyroid function blood test

Cushing's Disease (Hyperadrenocorticism)

Pot-bellied appearance, hair loss on the trunk, thin skin, increased thirst/urination

More common in middle-aged to older dogs

Demodicosis (Mange)

Patchy hair loss, especially around eyes and muzzle in puppies; more widespread in immunocompromised adults

Requires skin scraping by vet

Ringworm (Dermatophytosis)

Circular patches of hair loss with scaling; can spread to humans

Fungal infection — antifungal treatment required

Alopecia X (Black Skin Disease)

Symmetrical hair loss, skin hyperpigmentation; primarily affects Nordic breeds

Diagnosis by exclusion; benign but cosmetic

⚠️

If hair loss is patchy, asymmetric, or accompanied by other symptoms, consult a vet before changing diet. Dietary changes alone won't resolve disease-caused hair loss and may delay proper diagnosis.

🔗 Related Guides

Skin Allergy Guide →Supplement Guide →Food Grades →