Spaying and Neutering Cats: Why, When and What to Expect

Spaying (females) and neutering or castration (males) are the most common surgeries vets perform on cats. For pet cats not intended for a responsible breeding program, veterinary organizations widely recommend them — for the cat's health, behavior and to prevent unwanted litters. Timing and details should always be agreed with your vet.

What the surgery involves

• Spay (ovariohysterectomy or ovariectomy): removal of the ovaries (and usually the uterus) under general anesthesia. Performed through a small incision on the belly or flank.
• Neuter (castration): removal of the testicles under general anesthesia. A quick procedure, usually without stitches.

Both are day procedures in most clinics.

Benefits

For females

• No heat cycles — no yowling, restlessness and attempts to escape every few weeks
• No pregnancies. An unspayed cat can have several litters a year
• Lower risk of mammary (breast) cancer, especially if spayed young; mammary tumors in cats are usually malignant
• No risk of pyometra (a life-threatening uterine infection) or ovarian and uterine disease

For males

• Far less urine spraying and strong odor
• Much less roaming, which reduces road accidents and getting lost
• Fewer fights — and so less risk of abscesses and FIV (feline immunodeficiency virus), which spreads through bites
• No testicular disease

For the community: fewer homeless and feral cats, and fewer kittens euthanized in shelters.

When should it be done?

Cats can reach sexual maturity surprisingly early — from around 4 months. Many veterinary organizations therefore recommend spaying and neutering pet cats by about 5 months of age (the "Feline Fix by Five" approach in North America), before the first heat or the onset of spraying. Shelters often neuter kittens earlier, at around 8–12 weeks and above a minimum weight, which is considered safe in experienced hands.

Adult cats can be neutered at any age after a health check. Discuss the right timing for your cat with your vet — breed, health and local practice all play a role.

Before surgery

• Your vet will explain fasting instructions — usually no food from the night before (kittens may have shorter fasts). Water is usually allowed until the morning.
• Keep your cat indoors the night before so they can't eat elsewhere.
• Ask about pain relief, pre-anesthetic blood tests and whether a microchip can be placed at the same time.

Recovery at home

• Keep your cat indoors and quiet for 7–14 days (as directed). Discourage jumping for a few days.
• Check the wound daily. Mild redness is normal; call your vet if you see swelling, discharge, bleeding or gaping.
• Stop licking at the wound using a cone (e-collar) or a surgical recovery suit if your vet recommends one.
• Use shredded paper or paper-based litter for a few days if advised, to keep dust out of the wound.
• Your cat may be sleepy and eat less on the first evening; offer a small meal. If they haven't eaten by the next day, or seem in pain, call the vet.
• Give pain medication exactly as prescribed — never give human painkillers.

After neutering: watch the weight

Energy requirements fall after neutering while appetite often rises. Reduce portions (or switch to a food for neutered cats) and weigh your cat monthly. See overweight cats and neutering.

Common myths

• "She should have one litter first." There's no benefit — spaying before the first heat gives the most protection against mammary cancer.
• "Neutering changes their personality." It reduces hormone-driven behaviors (spraying, roaming, fighting); your cat's core personality stays the same.
• "Indoor cats don't need it." Unspayed indoor females still go through repeated heats, and intact males still spray. Cats are also experts at escaping when hormones call.
• "It makes cats fat." Overfeeding makes them fat. Adjust portions and play more.