A female dog’s genital area consists of the vulva, a soft, rounded structure located beneath the anus and between the hind legs. In a healthy, non-pregnant adult dog that isn’t in heat, it’s a relatively small, neat mound of tissue with a vertical slit in the center. The color is typically pinkish to dark pink, though pigmentation varies with breed and coat color. Knowing what normal looks like makes it much easier to spot when something is off.
Normal Vulva Anatomy
The vulva is made up of two fleshy folds of skin called labia that meet at the top and bottom, forming a vertical seam. In a resting state (outside of heat), the vulva sits fairly flat against the body and isn’t particularly prominent. On short-haired breeds, it’s easy to see. On long-haired breeds, it can be mostly hidden by fur.
The size of the vulva varies with the dog’s overall body size and whether she’s been spayed. In most healthy dogs outside of heat, the tissue should look smooth, without any redness, swelling, or discharge. A small amount of clear moisture is normal, but anything sticky, colored, or foul-smelling warrants attention.
How the Vulva Changes During Heat
If your dog is intact (not spayed), her vulva will change noticeably during her heat cycle, which typically happens twice a year. There are four stages, and only the first two produce visible changes.
During proestrus, the first stage, rising estrogen causes the vulva to swell significantly. It can puff up to two or three times its normal size and appear redder than usual. You’ll also notice a bloody vaginal discharge that can range from light pink to dark red. This stage lasts roughly 7 to 10 days.
During estrus, the second stage, the swelling may soften slightly and the discharge often shifts to a straw or yellowish color, though this varies from dog to dog. This is the stage when the dog is actually fertile. It also lasts about 7 to 10 days.
After estrus ends, the vulva gradually returns to its normal size. During the final two stages, diestrus and anestrus, the external anatomy looks identical and unremarkable. If your dog’s vulva stays swollen long after her heat cycle should have ended, that’s worth investigating.
Spayed Dogs and Recessed Vulvas
Spaying removes the ovaries, which means the vulva never experiences the hormonal surges of a heat cycle. In most spayed dogs, the vulva stays small and tucked close to the body for life. This is completely normal.
Some spayed dogs develop what’s called a recessed or “hooded” vulva, where the vulva sits slightly sunken and is surrounded by extra skin folds. A study in the Journal of the American Veterinary Medical Association found that recessed vulvas were significantly more common in spayed dogs than in intact dogs, and dogs spayed before one year of age were nearly three times as likely to have one compared to dogs spayed later.
A recessed vulva has long been assumed to increase the risk of urinary tract infections and skin irritation in the surrounding folds. However, that same study found no significant difference in the rates of UTIs, urinary incontinence, or skin inflammation between dogs with recessed vulvas and those without. So while a hooded vulva looks a bit different, it doesn’t automatically mean problems. Only a small number of dogs in the study had visible skin irritation around the area.
Puppies vs. Adult Dogs
A puppy’s vulva is noticeably smaller and less developed than an adult’s. It can look almost flat or barely visible, especially in very young puppies. As the dog matures and, if intact, goes through her first heat cycle, the vulva becomes more prominent.
Puppies sometimes develop a mild form of vaginitis, which shows up as small amounts of clear to cloudy, slightly sticky discharge around the vulva. You might catch your puppy licking the area more than usual. In most cases, this is harmless and resolves on its own without treatment. If the discharge is minimal and your puppy seems fine otherwise, it’s generally not a concern.
Signs That Something Is Wrong
Knowing the baseline makes it easier to catch problems early. Here are the changes worth paying attention to:
- Unusual discharge. A small amount of clear moisture is normal. Discharge that is yellow, green, thick, or foul-smelling points to possible infection. Cream-colored or bloody discharge in a spayed dog (or an intact dog well outside her heat cycle) can signal a serious uterine infection called pyometra, which requires urgent care.
- Excessive licking. Some grooming is normal, but persistent licking of the vulvar area is one of the most common signs of vaginitis or a urinary tract infection.
- Redness and swelling outside of heat. If the vulva or surrounding skin looks inflamed, irritated, or raw in a dog that isn’t in heat, infection or allergic dermatitis may be the cause.
- A visible mass or growth. Any lump, bump, or tissue protruding from the vulva is abnormal. Vulvar and vaginal tumors in dogs most commonly show up as a protruding mass or unexplained discharge.
- Scooting or frequent urination. Dogs with vaginitis or UTIs often scoot their rear along the ground or urinate in small, frequent amounts. You might also notice accidents in the house or blood in the urine.
Keeping the Area Clean
Most dogs keep their vulvar area clean on their own through normal grooming. For dogs with skin folds around the vulva, overweight dogs, or dogs with a recessed vulva who seem prone to moisture buildup, gentle cleaning with unscented baby wipes once or twice a day can help prevent irritation. Avoid anything with alcohol or harsh chemicals, as the skin in that area is sensitive.
Douching or flushing the vaginal area is not recommended and hasn’t been shown to be effective. In the vast majority of cases, about 73% in one clinical review, mild vaginitis resolves on its own regardless of what treatment is used. Keeping a simple calendar of when you notice discharge or excessive licking can help you track whether things are improving or getting worse over time.