When to Spay a Cat

On when to spay a cat, the Veterinary Task Force on Feline Sterilization recommends by 5 months of age. That lands before most cats can become pregnant, and the task force found no added risk of complications from spaying kittens much younger.

If your cat is already older, ask your vet about timing. The ASPCA notes that adult cats can be spayed, even while in heat.

The reasoning behind that five-month mark is worth knowing. The AAFP notes that many owners don't realize a cat can become pregnant, or start spraying, before 6 months of age.

When is the best time to spay a cat?

The task force's answer is by five months. It reviewed the evidence in 2016 and found that female cats can become pregnant as early as 4 months of age, so waiting until six months can leave a window for an unplanned litter.

The task force also suggested a practical schedule: book the surgery at the end of the kitten vaccine series. Your kitten is already visiting the vet, and the AAHA/AAFP guidelines place the end of that series at 16 to 18 weeks.

Age	What the sources say
6–14 weeks	"Pediatric" spay. Studies show it can be done safely at this age (AAFP)
8 weeks	Generally considered safe, per the ASPCA
4 months	Earliest age a female cat may become pregnant (task force)
By 5 months	The recommended target for cats not meant for breeding (task force)
4–12 months	Range for puberty in female cats (Merck)

Not sure how old your kitten is? Our guide to how old is my kitten helps you estimate from teeth, weight and behavior.

Is it safe to spay a young kitten?

The task force found no increased risk of complications or long-term health effects from spaying at 6 to 14 weeks or after 16 weeks. The ASPCA says it is generally considered safe from eight weeks old.

Younger kittens may even have it easier. The AAFP lists a shorter surgery time and a rapid recovery among the advantages of early spaying.

There are sensible limits. The AAFP notes that many vets won't operate below a set weight, often 1 kg (about 2.2 pounds).

The final call on timing belongs to your vet. The AAFP quotes the AVMA's policy, which asks vets to use their best medical judgment for each animal. Both groups, along with AAHA and the ASPCA, endorse early spaying.

Concerns have been raised about early spaying and growth, weight and the immune system. The AAFP's review found that early neutering does not seem to harm a cat's skeletal, physical or behavioral development.

What happens if you wait too long?

Here's the surprising part. Cats are induced ovulators, Merck explains, which means mating triggers the release of eggs. A cat in heat who doesn't mate generally doesn't ovulate, so the cycle comes around again.

Merck's figures show how often. Cats cycle every 14 to 21 days from spring through early fall, and each heat lasts about 6 to 7 days. The ASPCA puts it at four to five days every three weeks during breeding season.

On those figures, an unspayed indoor cat can spend a large part of the breeding season in heat. Merck describes the behavior: rolling, rubbing against objects, kneading with the back feet, and loud, repeated yowling. The ASPCA adds more frequent urination, sometimes around the house.

If she does get outside and mates, pregnancy lasts 60 to 65 days, according to Merck.

If you've come across a litter outdoors, our guide to found a kitten walks through the first steps.

What are the health benefits of spaying a cat?

The ASPCA states that spaying before her first heat offers the best protection from these diseases.

The task force lists the evidence for spaying kittens before that first cycle:

• A lower risk of mammary carcinoma, a breast cancer. The ASPCA notes that about 90 percent of breast tumors in cats are malignant.
• No risk of reproductive emergencies such as pyometra, a serious uterine infection, or a difficult birth (dystocia).
• No unplanned pregnancies, which can begin as early as 4 months.
• A possible decrease in the behavior problems that lead people to give up a cat.

The AAFP adds that spaying prevents diseases of the uterus and ovaries, and that some studies suggest neutered animals may live longer. That last point is a "some studies suggest," and the research is not settled.

Will spaying change my cat?

The AAFP lists roaming, urine marking, fighting and the behaviors of heat among the problems early neutering removes or reduces. The ASPCA adds a caution: how much behavior changes depends on the individual animal, and there's no guarantee.

Spraying is a partial exception. The AAHA/AAFP Feline Life Stage Guidelines say neutering is still advisable, citing a study of free-roaming cats in which spraying almost disappeared after neutering. The same guidelines add that it won't stop spraying in every cat.

What about weight gain?

The sources differ in emphasis here. The ASPCA says spaying won't make a cat overweight, and that overfeeding and too little exercise will. The AAHA/AAFP guidelines note that neutering is associated with weight gain and is a risk factor for obesity, especially in males.

Either way, ask your vet whether her portions should change after spaying. Our guide on how much should I feed my cat covers how to measure meals.

How do I care for my cat after spaying?

The ASPCA's aftercare advice centers on keeping her calm and keeping her tongue away from the incision:

• Give her a quiet place to recover indoors, away from other animals.
• Stop running and jumping for up to two weeks, or as long as your vet recommends.
• Keep her from licking the incision, which may cause infection. The ASPCA suggests a well-fitted Elizabethan collar (a cone).
• No bathing for at least ten days.
• Look at the incision every day to check it is healing.

The ASPCA says to call your vet if:

• you notice redness, swelling or discharge at the surgery site
• the incision is open
• she is lethargic or loses her appetite
• she has vomiting or diarrhea

Questions new kitten parents ask

Can you spay a cat in heat?

Yes. The ASPCA states that it is possible to spay a female cat while she's in heat. Ask your vet whether they prefer to wait.

Is 5 months too early to spay a cat?

The task force recommends spaying by five months, and found no added risk from spaying kittens as young as 6 to 14 weeks. Your vet makes the final call for your kitten.

Can a 4 month old kitten get pregnant?

It can happen. The task force notes that unintended pregnancies may occur as early as 4 months of age.

How long does it take a cat to recover from spaying?

The ASPCA advises limiting running and jumping for up to two weeks, or as long as your vet recommends. The AAFP lists a rapid recovery among the advantages of spaying young kittens.

Is it too late to spay an older cat?

The ASPCA notes that adult cats can be spayed. Ask your vet whether spaying is right for your cat at her age and health.

Sources

• Veterinary Task Force on Feline Sterilization: Recommendations for Age of Spay and Neuter Surgery, 2016
• AAFP Position Statement: Early Spay and Castration. Journal of Feline Medicine and Surgery
• ASPCA: Spay/Neuter Your Pet
• Merck Veterinary Manual: Features of the Reproductive Cycle
• Merck Veterinary Manual: Management of Reproduction of Cats
• Quimby J, et al. 2021 AAHA/AAFP Feline Life Stage Guidelines. Journal of the American Animal Hospital Association, 2021

This article is for general information and is not veterinary advice. Talk to your vet about your own cat — they know the animal in front of them.

Choolip products are food supplements, not medicine. They are not intended to diagnose or manage any medical condition. If your cat has been diagnosed with a condition, their diet should be set by your vet.