CONDITION

Sebaceous Adenitis

Why this matters now

Sebaceous adenitis typically develops in young adult dogs, most commonly between 1 and 5 years of age. However, onset can occur at any age. The condition is often first noticed as subtle coat changes that progressively worsen.

The disease tends to be slowly progressive without treatment. Early stages may show only minor scaling and dull coat, but advanced cases can develop extensive hair loss, thickened skin, and secondary infections. Some dogs experience cyclic improvement and worsening. Response to treatment varies considerably between individuals.

Signals & patterns

Early signals

Dull, dry coat

The coat may lose its normal sheen and feel coarser or more brittle than usual.

White or silver scaling

Fine scales may appear along hair shafts, particularly visible in dark-coated dogs.

Hair that clumps or mats easily

Without normal sebaceous secretions, hair may stick together in small clumps.

Subtle thinning on the head or ears

Hair loss often begins in specific areas before becoming more generalised.

Later signals

Follicular plugging

Keratinous material accumulates around hair follicles, creating a characteristic "follicular cast" appearance.

Symmetrical hair loss

In Standard Poodles, hair loss typically affects the head, ears, and dorsum in a symmetric pattern.

Thickened, wrinkled skin

The skin may become hyperpigmented and develop a thickened, corrugated texture.

Secondary bacterial infections

Without protective sebum, the skin becomes more susceptible to bacterial overgrowth.

Click to read about the biological mechanisms

How this is usually investigated

Diagnosis of sebaceous adenitis requires skin biopsy to demonstrate the characteristic glandular inflammation and destruction.

Skin biopsy

Purpose: Histopathology reveals inflammation around sebaceous glands (in early stages) or complete absence of these glands (in later stages).
Considerations: Multiple biopsy samples may be taken from affected areas. This is the definitive diagnostic test.

Clinical examination

Purpose: Characteristic distribution of scaling and hair loss, particularly in predisposed breeds, raises suspicion.
Considerations: Clinical signs alone are suggestive but not diagnostic. Other skin conditions can look similar.

Skin cytology

Purpose: Helps identify secondary bacterial or yeast infections that may complicate the condition.
Considerations: Does not diagnose sebaceous adenitis itself but guides secondary infection management.

Trichogram

Purpose: Examination of hair samples may reveal follicular casts adhered to hair shafts.
Considerations: Supportive finding but not specific to sebaceous adenitis.

Options & trade-offs

Management of sebaceous adenitis focuses on replacing lost skin oils, controlling scaling, and managing secondary complications.

Oil therapy

Topical oil soaks (often using mineral oil or proprietary products) help replace lost sebum and soften keratinous debris.

Trade-offs: Labour-intensive, requiring regular application and thorough bathing. Often forms the cornerstone of management.

Keratolytic shampoos

Medicated shampoos help remove scale and follicular plugs.

Trade-offs: Requires regular use. Different formulations suit different dogs.

Fatty acid supplementation

Omega fatty acids may support skin barrier function and reduce inflammation.

Trade-offs: Benefits vary between individuals. Usually part of multimodal management rather than sole therapy.

Immunomodulatory therapy

Ciclosporin or other immunomodulators may help in some cases by reducing the immune attack on sebaceous glands.

Trade-offs: May slow progression but cannot restore already-destroyed glands. Requires monitoring for side effects.

Antibiotic therapy

May be needed to treat secondary bacterial skin infections.

Trade-offs: Addresses secondary complications but not the underlying condition.

Common misconceptions

Misconception:

"Sebaceous adenitis is a type of allergy."

Reality:

Sebaceous adenitis is an autoimmune condition targeting sebaceous glands, not an allergic response to environmental or food triggers.

Misconception:

"The condition is contagious."

Reality:

Sebaceous adenitis is not infectious and cannot be transmitted between dogs or to humans. It has a genetic basis in affected breeds.

Misconception:

"Treatment can cure the condition."

Reality:

Management can significantly improve coat quality and comfort, but destroyed sebaceous glands do not regenerate. Ongoing management is typically needed.

Understanding the hereditary nature of sebaceous adenitis in predisposed breeds provides important context. Learning about the typical grooming and management routines involved can help owners prepare for the commitment required. Documenting coat changes over time with photographs may provide useful information for your veterinary team.

Last reviewed: 24 April 2026 · Dr Alastair Greenway MRCVS