Spaying a cat is a surgical procedure that removes the reproductive organs while the cat is under general anesthesia. The standard technique in the United States and Canada is an ovariohysterectomy, which removes both the ovaries and the uterus through a small incision in the abdomen. From pre-surgical prep to the final stitch, the entire process typically takes less than an hour of operating time, with most cats going home the same day.
What Gets Removed
Two versions of this surgery exist. An ovariohysterectomy removes both the ovaries and the uterus, and it’s the technique taught at virtually every veterinary school in North America. An ovariectomy removes only the ovaries, leaving the uterus in place. Both achieve the same result (permanent sterilization, no more heat cycles), but ovariectomy uses a smaller incision positioned slightly higher on the abdomen. In Europe, ovariectomy is more common, while North American vets overwhelmingly perform ovariohysterectomies.
Pre-Surgical Preparation
Your vet will ask you to withhold food for roughly 6 to 12 hours before the appointment, depending on the clinic’s protocol. Water is usually allowed up until the morning of surgery. Fasting prevents vomiting during anesthesia, which can be dangerous if stomach contents enter the airway.
Most clinics run basic bloodwork beforehand, including a complete blood count and a chemistry panel. These tests check organ function (especially the liver and kidneys, which process anesthetic drugs) and confirm the cat is healthy enough for surgery. Some clinics include this as part of the spay package; others run it as a separate appointment days before.
Anesthesia and Monitoring
On the day of surgery, your cat receives a combination of drugs to manage sedation, pain, and anesthesia. The process starts with a sedative and a pain reliever, often an opioid, given as an injection. Once the cat is calm, an intravenous anesthetic agent is used to induce full unconsciousness. The cat is then intubated (a breathing tube is placed in the airway) and maintained on inhaled anesthetic gas for the duration of the procedure.
Throughout surgery, the veterinary team monitors heart rate and rhythm, blood oxygen levels via a pulse oximeter clipped to the tongue or paw, blood pressure, breathing rate, and body temperature. Cats lose heat quickly under anesthesia, so warming pads or blankets are standard. A technician also checks reflexes periodically to gauge how deeply the cat is sedated and adjusts the anesthetic accordingly.
The Surgery Step by Step
The cat is placed on her back and the fur on the lower abdomen is shaved and cleaned with antiseptic solution. A sterile drape is placed over the body, leaving only the surgical site exposed.
The surgeon makes a small incision along the midline of the abdomen, typically 2 to 3 centimeters long, cutting through skin, the fat layer beneath it, and the abdominal wall muscle. Once inside the abdomen, the surgeon locates the first ovary by hooking the uterine horn (one of the two branches of the uterus) with a finger or instrument and following it up to the ovary.
The suspensory ligament, a band of tissue anchoring the ovary in place, is carefully broken to bring the ovary out through the incision. The blood vessels supplying the ovary (called the ovarian pedicle) are then clamped and tied off with suture material or sealed with a specialized device. This ligation step is critical because it prevents bleeding once the tissue is cut. The surgeon cuts the pedicle above the ties and releases the ovary. The same process is repeated on the opposite side.
With both ovaries freed, the surgeon follows the uterine horns down to where they meet at the uterine body, just above the cervix. The uterine blood vessels are clamped and ligated, the uterus is clamped, tied, and severed. The entire reproductive tract, both ovaries plus the uterus, comes out as one piece.
Closure happens in layers. The abdominal wall muscle is sutured first, then the tissue beneath the skin, and finally the skin itself. Some clinics use absorbable sutures under the skin that don’t need removal; others place external stitches or skin staples that come out in 10 to 14 days.
Pain Management Before, During, and After
Modern spay protocols use multiple types of pain relief working through different pathways. Before and during surgery, cats commonly receive an opioid pain reliever. About 83% of veterinary clinics in one UK survey also gave cats an anti-inflammatory medication during or immediately after the procedure, with most continuing it for two to five days at home. This layered approach, combining an opioid for immediate surgical pain with an anti-inflammatory to manage swelling and discomfort over the following days, keeps cats significantly more comfortable than older single-drug approaches.
Your vet will typically send you home with oral pain medication and clear instructions on how many days to give it. Cats are good at hiding pain, so finishing the full course matters even if your cat seems fine.
Recovery at Home
The first 10 to 14 days after surgery are the critical recovery window. During this time, your cat needs strict activity restriction: no running, jumping on furniture, or rough play. Strenuous movement can cause swelling around the incision, loosen sutures prematurely, or even open the wound.
A cone collar (the plastic “e-collar”) should stay on for the full 10 to 14 days. It prevents licking and chewing at the incision, which is the most common cause of post-surgical complications in otherwise healthy cats. Check the incision twice a day. You’re looking for the wound edges staying closed, mild pinkness that gradually fades, and no discharge. Increasing redness, swelling, oozing, or gaps in the incision line are signs something needs veterinary attention.
Most cats are groggy and subdued the evening after surgery but start eating and moving around normally within 24 to 48 hours. Full internal healing of the abdominal wall takes about two weeks, which is why the activity restriction period matches that timeline.
Complication Rates
Spaying is one of the most commonly performed surgeries in veterinary medicine, and serious complications are rare. In a review of nearly 16,000 cat spays at a large clinic, only 0.3% of cats experienced a pedicle tear or drop (where the tied-off ovarian tissue slips from its ligature), and just 0.12% had pedicle-related bleeding. In every bleeding case, it was caught and corrected during surgery without lasting harm. No pedicle-related deaths occurred in the entire study.
Minor complications are more common than major ones. Small fluid pockets (seromas) can form under the skin near the incision, and granulomas (small lumps of inflamed tissue) occasionally develop at the internal stitch sites. These usually resolve on their own or with minimal treatment.
Laparoscopic Spaying
Some veterinary clinics now offer laparoscopic (minimally invasive) spays. Instead of a single open incision, the surgeon inserts a tiny camera and instruments through two small ports in the abdomen, each only 5 to 6 millimeters wide. The abdomen is gently inflated with carbon dioxide gas to create working space, and the ovarian blood vessels are sealed using a specialized bipolar device rather than traditional suture ties.
Cats who had laparoscopic spays showed significantly lower pain scores at 1, 4, and 8 hours after surgery compared to cats who had the traditional open approach, along with lower stress hormone levels. Surgical time and complication rates were similar between the two methods. The tradeoff is cost: laparoscopic equipment is expensive, and not every clinic has it. If lower post-operative pain is a priority and a laparoscopic option is available in your area, it’s worth asking about.
Why Timing Matters
The current veterinary consensus, endorsed by the American Animal Hospital Association, recommends spaying cats by five months of age. Cats can reach sexual maturity as early as five months, so waiting longer risks an unplanned pregnancy or the behavioral changes that come with heat cycles, including yowling, spraying, and attempts to escape outdoors.
The health case for early spaying is strongest when it comes to mammary tumors, which are the third most common cancer in cats and are malignant roughly 85% of the time. Spaying before six months of age reduces mammary tumor risk by 91%. Spaying before one year still provides an 86% reduction. But waiting until after two years drops the benefit to just 11%. In shelter settings, kittens can be safely spayed as young as eight weeks. There is no evidence that spaying cats before sexual maturity causes orthopedic, behavioral, or other medical problems, which distinguishes cats from certain large-breed dogs where early neutering carries more nuance.