Pyometra surgery is the removal of an infected, pus-filled uterus and both ovaries from a dog or cat. The medical name for the procedure is ovariohysterectomy (OHE), which is essentially a spay performed under emergency or urgent conditions. It is the most effective and most commonly recommended treatment for pyometra, a serious uterine infection that can become fatal without intervention. Survival rates for dogs that undergo the surgery are roughly 97%, and cats fare even better at nearly 100%.
Why Surgery Is Needed
Pyometra develops when bacteria colonize the uterus, usually within a few weeks after a heat cycle. The uterine lining thickens under hormonal influence, creating an environment where infection takes hold and pus accumulates. Left untreated, the infection can spill into the bloodstream, cause kidney damage, or lead to uterine rupture and a life-threatening abdominal infection called peritonitis.
The condition comes in two forms. In open pyometra, the cervix stays partially open, so you’ll typically notice cream-colored or bloody vaginal discharge. Your pet may still be visibly sick, but the draining pus somewhat limits the pressure inside the uterus. In closed pyometra, the cervix is sealed shut, trapping all the infected material inside. This version is more dangerous because the toxins build up faster, the risk of rupture is higher, and the animal tends to deteriorate quickly. Closed pyometra is treated as a surgical emergency.
What Happens During the Procedure
Before surgery, the veterinary team works to stabilize your pet. Animals with pyometra often arrive dehydrated, feverish, or septic, so they typically receive intravenous fluids and antibiotics to get them into safer condition for anesthesia. Blood work and an ultrasound (which can cost $348 to $883 on its own) help confirm the diagnosis and assess how sick the animal is.
The surgery itself follows the same basic steps as a routine spay, but with a much sicker patient and a uterus that may be massively swollen with infected fluid. The surgeon makes an incision along the abdomen, carefully isolates the blood vessels supplying the ovaries and uterus, clamps and seals those vessels, then removes the entire uterus and both ovaries. The uterine stump is ligated and the abdomen is closed. The key challenge is handling the fragile, distended uterus without rupturing it, since spilling pus into the abdominal cavity can cause peritonitis.
Risks and Complications
Pyometra surgery carries more risk than a standard spay because the patient is already fighting a systemic infection. The primary dangers of the disease itself include sepsis (bacteria in the bloodstream), kidney damage, and uterine rupture. About 3% of dogs and 4% of cats in one large study had a ruptured uterus by the time of surgery.
Surgical complications can include hemorrhage during the procedure, accidental injury to the ureters (the tubes connecting the kidneys to the bladder), and stump pyometra, where infection recurs in the small remaining piece of uterine tissue. Some dogs also develop urinary incontinence after the ovaries are removed, though this is uncommon. Mortality rates in published studies range from 1% to 10% depending on how sick the animal was at the time of surgery, with most large studies landing around 3%.
Recovery After Surgery
Most pets stay in the hospital for at least one night, and roughly 44% of dogs need two or more nights of hospitalization. Cats have slightly shorter stays on average. During this time, your pet continues receiving fluids and antibiotics while the veterinary team monitors for signs of ongoing infection or surgical complications.
Once home, the recovery timeline looks similar to any abdominal surgery. Activity should be restricted for at least one to two weeks: no running, jumping, climbing stairs, or rough play. The incision needs to stay dry, so no baths or swimming until the vet clears it. Skin sutures or staples are typically removed 7 to 14 days after surgery. Most dogs and cats bounce back noticeably within the first few days, eating and moving around with increasing energy, though full internal healing takes longer.
Watch the incision daily for redness, swelling, discharge, or any sign that the wound is opening. A sudden spike in lethargy, loss of appetite, or vomiting after an initial improvement warrants a call to your vet, as these could signal a secondary infection.
How Much Pyometra Surgery Costs
The total bill varies widely depending on how sick your pet is, where you live, and whether the surgery happens during regular hours or as an after-hours emergency. Quoted prices from veterinary surgeons range from $1,100 to $1,900 on the lower end and $2,200 to $6,200 for more complex cases. That range typically includes the surgery itself but may or may not cover pre-operative stabilization (IV fluids, antibiotics, blood work), the ultrasound, anesthesia monitoring, and post-operative hospitalization. Ask your vet for an itemized estimate so you know what’s included.
Medical Treatment as an Alternative
Surgery is not the only option, but it is the safest and most reliable one. Medical management using hormone-blocking drugs and compounds that cause the uterus to contract can resolve open pyometra in some cases. This approach is generally reserved for breeding animals whose owners want to preserve fertility, or for pets that are too unstable to undergo anesthesia safely.
The limitations are significant. Medical treatment only works for open pyometra, where the cervix allows the infected material to drain. It takes several days to show improvement, and some animals never respond and end up needing surgery anyway. Side effects include panting, drooling, vomiting, diarrhea, and the risk of uterine rupture during treatment. Animals with closed pyometra, sepsis, kidney dysfunction, or peritonitis are not candidates. Even when medical treatment succeeds, the infection can recur with future heat cycles, so it’s generally considered a temporary solution unless the animal is spayed afterward.
Long-Term Outlook
For the vast majority of pets, pyometra surgery is curative. Once the uterus and ovaries are removed, the infection source is gone and recurrence is essentially impossible (with the rare exception of stump pyometra). Owners in follow-up studies report good to excellent quality of life after recovery, and most animals return to their normal energy levels and routines within a few weeks. The earlier the surgery happens in the course of the disease, the smoother the recovery tends to be.