TL;DR: A swollen vulva in dogs is often caused by the heat cycle or mild irritation and is usually not an emergency, but you should schedule a vet visit within 48 hours if you notice discomfort or discharge.
What are the symptoms and causes of a swollen vulva in dogs?
- Visible enlargement and inflammation of the external genitalia.
- Common causes include the natural estrus (heat) cycle, localized skin infections, urinary tract infections, or allergic reactions.
- Symptoms may include frequent licking of the area or restlessness due to discomfort.
How urgent is it if my dog has a swollen vulva?
- In most cases, a swollen vulva is a low-urgency concern, especially if your dog is otherwise acting normally.
- The condition is rarely a life-threatening emergency unless accompanied by severe lethargy, vomiting, or a foul-smelling discharge.
- You should schedule a veterinary appointment within the next 24 to 48 hours.
Why does my veterinarian need a photo of my dog's swollen vulva?
- A clear, well-lit photo helps the triage professional see the exact shade of the tissue, such as pink versus dark red.
- Visuals help identify the specific location of the swelling and the presence of any discharge.
- This evidence helps determine if the issue is a standard heat cycle or something requiring more immediate diagnostic testing.
Clinical Context (Merck Veterinary Manual)
Swollen vulva in dogs can be caused by vaginal hyperplasia, a proliferation of the vaginal mucosa that occurs during proestrus and estrus due to estrogenic stimulation. The most common sign is a mass protruding from the vulva, which may initially be smooth but can become dry and develop fissures with prolonged exposure; a slight vaginal discharge may be present. Vaginal hyperplasia can interfere with copulation and typically resolves spontaneously as estrogen levels decline. Differential diagnoses for vulvar discharge should be considered, and vaginal cytology can help determine the nature of the discharge.
Chapter: Reproduction
Source: The Merck Veterinary Manual, 11th Edition (Page 1399)