What are the common causes of vaginal hyperplasia or prolapse?

Common causes include hormonal influences, inflammation, or tumours; however, the actual cause needs to be confirmed by a vet through examination and tissue testing if necessary. We recommend bringing your pet in for a consultation.

What temporary measures can be taken at home?

Keep the vulva clean, photograph or video the condition for documentation, avoid squeezing or applying any medication yourself, and contact your vet as soon as possible to arrange examination and treatment.

Can spaying prevent vaginal hyperplasia or prolapse?

Spaying alters hormonal status and can help prevent certain hormone-related conditions; however, whether it is appropriate should be assessed by your vet — please consult your veterinarian.

How often is follow-up needed after treatment?

Follow-up frequency depends on the cause and type of treatment; generally, revisits to assess healing and imaging are scheduled every few weeks to months after treatment. Follow your vet's specific instructions.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Vaginal Hyperplasia & Prolapse in Dogs: Symptoms, Diagnosis & Home Care [2025]

Oestrogen-driven vaginal mucosa proliferation and eversion, common in large-breed dogs during oestrus; spaying is curative

Take 1 minute to check the symptoms first

Last updated: 2026/01/06

Pethealthmap Editorial Team

Sources: WSAVA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek immediate emergency care

•Continuous heavy vaginal bleeding with signs of weakness or lethargy
•Prolapsed tissue turning black, severely swollen, or painful and unable to be reduced
•Animal is unable to urinate on its own or shows signs of obvious distress

Schedule a clinic visit soon (within 24–72 hours)

•Vulvar swelling or blood-tinged discharge but animal is otherwise alert
•Frequent urination or difficulty urinating but still able to pass urine
•Persistent licking of the vulva with signs of discomfort affecting sleep or appetite

01What symptoms indicate a problem?

With vaginal hyperplasia or prolapse, owners often notice swelling or protrusion of the vulva or vaginal tissue, accompanied by changes in discharge or urination behaviour; the animal may appear uncomfortable or lose appetite.

Noticeable swelling or protrusion of the vulva or vaginal tissue, appearing flesh-coloured or red
Increased vaginal discharge, which may contain blood or have an odour
Frequent urination, difficulty urinating, or changes in urination posture
Persistent licking of the vulva, indicating local discomfort or pain
Reduced energy or appetite, and noticeably decreased activity

Seek emergency care immediately if you notice the following symptoms:

⚠️ Heavy or continuous vaginal bleeding
⚠️ Difficulty urinating or complete inability to urinate
⚠️ Prolapsed tissue appears discoloured or damaged

02How to assess the situation at home? Key observations and criteria for seeking emergency care

Carefully observing and recording these details before your vet visit helps the veterinarian quickly assess the condition and arrange the necessary tests.

Note whether energy levels and activity change from day to day
Track changes in appetite and daily water intake
Record urination frequency, any difficulty, or presence of blood in urine
Observe and note whether the vulva is swollen, reddened, or appears painful
Use your phone to photograph or video the discharge, vulva, or urination
If urinary obstruction is suspected, seek a clinic that can assess this promptly

03How will the vet diagnose this? Common examination and tests

The vet will begin with a physical examination and combine it with laboratory and imaging tests; tissue sampling may be taken when necessary to clarify the cause.

Physical examination

assessing the extent of vulvar and vaginal protrusion and tenderness

Urinalysis

ruling out urinary tract infection or haematuria

Blood and biochemistry panel

evaluating overall health and surgical risk

X-ray or ultrasound

examining pelvic, urinary, or reproductive tract structures

Tissue biopsy

confirming cell type and possible underlying cause

04What treatment and care are needed after diagnosis? Medications, diet adjustments, and home care guide

Treatment varies depending on the cause and severity; regular follow-up is needed after surgery or during medication, and home care and hygiene management are equally important.

Schedule follow-up visits as directed to monitor lesion size and recovery progress
Report any medication or treatment responses to your vet regularly and adjust as instructed
Manage diet and weight to support urinary health and overall immunity
Keep the vulva clean at home and care for any wounds to prevent recurrent infection
Arrange follow-up imaging or repeat tissue sampling if recommended by your vet

05What to prepare before the vet visit? Key information to help the vet identify the cause quickly

Note when symptoms began, how they have progressed, and any significant recent changes

List current medications, supplements, and recent vaccination history

Record recent diet, bowel and bladder habits, and water intake

Take photos or video of any discharge, the vulva, or urination behaviour

Bring previous test reports or imaging records (if available) for comparison

Call ahead to book an appointment and ask whether same-day tests can be arranged

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.

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