Spaying a cat is a surgical procedure that removes a female cat’s reproductive organs so she can no longer become pregnant or go into heat. It’s one of the most common veterinary surgeries performed worldwide, and most vets recommend it for any cat not intended for breeding. The procedure is permanent, and beyond preventing litters, it offers significant health and behavioral benefits.
What Happens During the Surgery
During a spay, a veterinarian makes a small incision in your cat’s abdomen and removes the ovaries and uterus. The full medical name for this is an ovariohysterectomy. Some vets perform an ovariectomy instead, which removes only the ovaries and leaves the uterus in place. Both approaches prevent pregnancy and stop heat cycles, but removing the uterus along with the ovaries eliminates any future risk of uterine infection, which is why ovariohysterectomy remains the more common choice.
The surgery is done under general anesthesia and typically takes 20 to 45 minutes. Your cat will be monitored throughout, and internal sutures hold the tissue together as it heals. These dissolve on their own over about four months. Some cats also receive external skin sutures or surgical glue to close the incision site.
When to Spay Your Cat
The Feline Veterinary Medical Association recommends spaying by five months of age for cats not intended for breeding. This timing matters because cats can become reproductively active as early as four to five months old, sometimes without showing obvious physical signs. Many owners are surprised to learn their kitten can get pregnant before she’s even half-grown.
Early spaying also offers the greatest health protection. Cats spayed before six months of age have a 91% reduced risk of developing mammary tumors compared to unspayed cats, according to data from the Morris Animal Foundation. That protective window narrows significantly with each heat cycle a cat goes through before being spayed.
Health Benefits of Spaying
The most significant long-term benefit is the dramatic reduction in mammary cancer risk. Mammary tumors in cats are aggressive; roughly 85% of feline mammary tumors are malignant. Spaying early is one of the most effective preventive measures available.
Spaying also eliminates the risk of pyometra, a life-threatening infection of the uterus. Pyometra occurs when bacteria infect the uterine lining, often during or after a heat cycle when the cervix is open. In unspayed cats, this is a genuine emergency that requires surgery to resolve. Removing the uterus takes this possibility off the table entirely.
Unspayed cats also face repeated hormonal stress from cycling in and out of heat. Cats are what’s called “seasonally polyestrous,” meaning they can cycle every two to three weeks during breeding season if they don’t mate. Each cycle puts the body through hormonal fluctuations that, over years, increase the risk of reproductive cancers and infections.
Behavioral Changes After Spaying
Heat behavior in cats is hard to miss. A cat in heat becomes intensely vocal, often yowling loudly and persistently, especially at night. She’ll rub against furniture, people, and doorways almost constantly, roll on the floor, and raise her hindquarters when touched along the back. Some cats in heat spray urine on walls and vertical surfaces to signal their availability to males. Others urinate more frequently around the house.
Spaying eliminates all of these behaviors because it removes the hormonal source driving them. Your cat will no longer go into heat, which means no yowling, no spraying, and no restless attempts to escape outdoors to find a mate. Roaming is a particular concern for unspayed cats because it exposes them to traffic, fights, and infectious diseases. Spayed cats are generally calmer and more content to stay home.
Weight Gain After Spaying
One real trade-off of spaying is that it changes your cat’s metabolism. Estrogen, which the ovaries produce, helps regulate appetite and energy use. Once the ovaries are removed, many cats experience a noticeable increase in hunger. Research shows that cats fed freely after spaying gain weight and fat mass within 8 to 12 weeks, and that extra weight can persist throughout adulthood if feeding habits aren’t adjusted.
This doesn’t mean spaying causes obesity. It means you’ll likely need to reduce how much you feed your cat after the surgery and be more deliberate about portion control. Up to 52% of adult cats are overweight or obese, and spaying is a recognized risk factor. The simplest approach is to stop free-feeding (leaving food out all day) and switch to measured meals. Your vet can help you figure out the right amount based on your cat’s size and activity level.
Surgical Risks
Spaying is considered very safe. A large study published in the Journal of Feline Medicine and Surgery found an anesthesia-related death rate of 0.1%, or roughly 1 in 1,000 cats. The most common issues during the procedure are temporary drops in blood pressure, a slower-than-normal heart rate, and mild hypothermia, all of which the veterinary team monitors and manages in real time. Serious complications like significant bleeding or post-surgical infection are uncommon in healthy cats.
That said, anesthesia does carry some inherent unpredictability, which is why your vet will typically recommend pre-surgical bloodwork to check organ function before putting your cat under. Younger, healthy cats handle anesthesia well as a rule.
Recovery and Aftercare
Most cats bounce back quickly, but the 7 to 10 days after surgery are critical for proper healing. During this window, you’ll need to restrict your cat’s activity. Running, jumping, and roughhousing can strain or reopen the incision. The easiest way to manage this is to confine your cat to a small, quiet room like a bathroom or laundry room where she can rest without being tempted to leap onto high surfaces.
Don’t bathe your cat or get the incision wet during recovery. If surgical glue was used to close the site, water will dissolve it prematurely. Avoid applying any ointments or creams to the area unless your vet specifically instructs you to.
Licking is the biggest threat to a clean recovery. If your cat starts licking or chewing at the incision, you’ll need an Elizabethan collar (the cone). It’s not comfortable, but it prevents her from pulling out sutures or introducing bacteria to the wound. Keep the cone on at all times except during supervised feeding. If your cat received external sutures or staples rather than surgical glue, those typically come out at a follow-up visit around day 10.
Some cats are groggy and quiet for a day or two after surgery, while others seem almost normal within hours. Both responses are typical. What you’re watching for during recovery is redness, swelling, or discharge at the incision site, loss of appetite lasting more than 24 hours, or lethargy that doesn’t improve after the first couple of days.