Bald Patches and Thinning Coats: Understanding Alopecia in Dogs

In this guide

Alopecia simply means hair loss, and in dogs it can show up as anything from a single small bald patch to widespread thinning across the body. Because so many different conditions can cause it, working out the pattern of hair loss is often the first useful clue.

Common causes

• Parasites, particularly mange mites and fleas, very common given India's climate and street dog contact
• Fungal infection (ringworm), which often causes circular, scaly bald patches and can spread to people
• Allergies, whether food, environmental, or flea related, usually causing hair loss alongside itching
• Hormonal disorders such as hypothyroidism or Cushing's disease, typically causing symmetrical thinning without much itching
• Pressure or friction alopecia, common on elbows and pressure points in dogs that lie on hard floors
• Post clipping alopecia, where hair is slow to regrow after shaving, seen more often in double coated breeds

Clues that help narrow it down

• Itchy hair loss usually points to parasites, allergies, or infection
• Non itchy, symmetrical hair loss on both sides of the body often points to a hormonal cause
• Circular patches with scaling suggest a fungal infection and warrant caution around handling, since ringworm is contagious to people
• Hair loss confined to pressure points suggests mechanical causes rather than disease

Diagnosis and treatment

A vet will typically start with a skin scrape to check for mites, a coat examination or fungal culture for ringworm, and bloodwork if a hormonal cause is suspected. Treatment follows the cause directly: anti-parasitic treatment for mites, antifungal medication for ringworm, allergy management for allergic hair loss, and hormone regulating medication for thyroid or adrenal conditions. Most causes of alopecia, once correctly diagnosed, respond well to targeted treatment, though hormonal causes usually need lifelong management rather than a cure.

Common Questions

Q: Will hair grow back after alopecia is treated? A: Often yes, once the underlying cause is resolved, though some hormonal conditions and certain scarring causes can leave permanently thinner coat in the affected area.

Q: Can stress cause hair loss in dogs? A: It is less common than in cats, but severe illness or prolonged stress can occasionally contribute to a dog's coat condition.

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