Health Article
Stud Tail

What is Stud Tail?
Stud tail, known medically as tail gland hyperplasia, is a skin condition affecting both cats and dogs. The condition centres on the supracaudal gland, a patch of sebaceous (oil‑producing) glands located on the upper surface of the tail near its base. When these glands become overactive, they produce excessive sebum, an oily secretion, which leads to greasy fur, clogged follicles, inflammation, and sometimes infection.

Although more commonly associated with intact males, unneutered males and females can also develop stud tail, indicating that hormones are not the only factor.

Causes of Stud Tail:
Hormonal Influence:
The most widely recognised cause is excess hormones, particularly testosterone.

Intact male cats and dogs are most frequently affected because testosterone stimulates the gland.

Skin Disorders. Some animals suffer from a condition in which the skin produces too much oil.
The excess oil clogs hair follicles in the tail and triggers inflammation.

Poor Grooming:
Cats that are obese, arthritic, or otherwise unable to groom effectively may accumulate oils and debris at the tail base.
Dogs with thick coats or underlying skin infections may also struggle to keep the area clean.

Blocked follicles can become infected with bacteria or yeast, worsening inflammation and discomfort.

Stud tail can range from mild to severe.
Common signs include:
Greasy, matted fur at the tail base
Hair loss or thinning
Blackheads
Scaling or crusting
Darkened, thickened skin
Redness, swelling, or discharge if infection is present
Itching or self‑trauma

Cats may show yellowing of light fur due to oil accumulation, while dogs may develop a noticeable bald patch.

Diagnosis:
Veterinarians typically diagnose stud tail based on clinical appearance. Additional tests may include:
Skin cytology to check for bacteria or yeast
Skin scrapings to rule out mites
Fungal culture for ringworm
Blood tests to investigate hormonal or endocrine disorders
Biopsy in cases of unusual swelling or suspected tumours

Treatment Options:
Topical Therapy:
For mild to moderate cases, treatment focuses on degreasing and unclogging affected hair follicles with shampoos, wipes or gels.
Regular bathing, often several times a week initially, helps reduce oil build up.

Managing Infection:
If secondary infection is present then antibiotics or anti-inflammatory medication may be used.

Hormonal Management:
For intact males, neutering often reduces gland activity and prevents recurrence.
However, it may not completely resolve the condition if other factors are involved.

Long‑Term Care:
Some animals require ongoing maintenance:
Regular grooming
Occasional medicated baths
Monitoring for flare‑ups

Prognosis:
With appropriate treatment, the prognosis for stud tail is generally very good.

Most cases respond well to topical therapy and infection control.
Chronic or severe cases may require further long term management, but the condition is rarely dangerous when treated promptly.