What Are Spaying and Neutering?

Spaying and neutering are surgical procedures that prevent pets from reproducing. Spaying (ovariohysterectomy) removes the ovaries and uterus in female animals, while neutering (orchiectomy) removes the testicles in males. Both procedures are performed under general anesthesia by a licensed veterinarian and are among the most common surgeries in veterinary medicine.

These procedures are a cornerstone of responsible pet ownership. Millions of dogs and cats enter shelters each year, and a significant number are euthanized due to lack of available homes. Spaying and neutering directly addresses this crisis while also providing substantial health and behavioral benefits for your individual pet.

Important: This information is for educational purposes only. Always consult your veterinarian for specific health concerns.

Health Benefits

For Female Pets

  • Eliminates the risk of ovarian and uterine cancer
  • Greatly reduces the risk of mammary (breast) cancer, especially when done before the first heat cycle. In dogs, spaying before the first heat reduces mammary cancer risk to less than 0.5 percent.
  • Prevents pyometra, a life-threatening uterine infection that affects approximately 25 percent of unspayed female dogs by age 10. Pyometra requires emergency surgery and can be fatal if not caught in time.
  • Eliminates heat cycles, which in dogs last approximately three weeks and occur twice yearly, and in cats can occur every two to three weeks during breeding season

For Male Pets

  • Eliminates the risk of testicular cancer
  • Reduces the risk of prostate problems, including benign prostatic hyperplasia and prostatitis
  • Reduces roaming behavior: Intact males are driven to seek mates and will escape yards, break through fences, and cross busy roads. Neutering significantly reduces this urge.
  • Reduces urine marking and spraying, especially when done before the behavior becomes habitual

Behavioral Benefits

Spaying and neutering influence hormonally driven behaviors, though they do not change your pet’s fundamental personality, intelligence, or playfulness.

Common behavioral improvements:

  • Reduced aggression toward other animals, particularly between intact males
  • Decreased territorial marking and spraying
  • Less mounting behavior
  • Reduced vocalization during heat cycles (particularly relevant for cats, as an unspayed female cat in heat can vocalize loudly and persistently)
  • Less motivation to roam or escape

It is important to understand that spaying and neutering are not a substitute for training. Behaviors that are learned rather than hormonally driven, such as jumping, pulling on leash, or poor recall, require consistent training to address.

When to Spay or Neuter

The optimal timing depends on your pet’s species, breed, and size. Veterinary recommendations have evolved as research has provided more nuanced guidance.

Dogs

  • Small breeds (under 20 kg / 45 lbs expected adult weight): Typically spayed or neutered around 6 months of age
  • Large and giant breeds: Some veterinarians recommend waiting until 12 to 18 months to allow full musculoskeletal development. Research in breeds like Labrador Retrievers and Golden Retrievers has shown that early spaying or neutering may slightly increase the risk of certain joint disorders and some cancers in large-breed dogs.
  • Individual assessment: Your veterinarian will consider your dog’s breed, size, lifestyle (indoor vs. roaming access), and health history to recommend the best timing

Cats

  • Standard recommendation: Most veterinary organizations recommend spaying and neutering cats at around 5 months of age, before they reach sexual maturity
  • Early-age spaying/neutering: Some shelters perform the procedure on kittens as young as 8 to 12 weeks, which research has shown to be safe with appropriate anesthetic protocols
  • Cats reach sexual maturity early, sometimes as young as 4 months, so timely scheduling is important

What to Expect: Before Surgery

Your veterinarian will provide specific pre-surgical instructions, which typically include:

  • Pre-anesthetic blood work to ensure your pet is healthy enough for anesthesia
  • Fasting: No food for 8 to 12 hours before surgery (water is usually allowed until a few hours before)
  • Medication review: Inform your vet of any medications, supplements, or recent illnesses
  • Drop-off: Most clinics ask you to drop your pet off in the morning. The surgery itself takes 20 to 60 minutes depending on the procedure and the animal’s size.

What to Expect: The Procedure

Spaying

  • A small incision is made in the abdomen (or, in laparoscopic spays, two to three tiny incisions)
  • The ovaries and uterus are removed
  • The incision is closed with sutures or surgical glue
  • Surgery typically takes 30 to 60 minutes

Neutering

  • An incision is made just in front of the scrotum
  • Both testicles are removed
  • The incision is closed with sutures (which may be absorbable or require removal)
  • Surgery typically takes 15 to 30 minutes

Both procedures are performed under general anesthesia with continuous monitoring. Pain management is provided during and after surgery.

Recovery Care

Most pets recover fully within 10 to 14 days. Your role during recovery is critical.

The First 24 Hours

  • Your pet may be groggy, quiet, or slightly disoriented from anesthesia. This is normal.
  • Offer small amounts of water and a light meal that evening
  • Keep them in a quiet, confined space
  • Monitor the incision site for excessive swelling, bleeding, or discharge

Days 2 Through 14

  • Restrict activity: No running, jumping, rough play, or climbing stairs unsupervised. Leash walks only for dogs.
  • Prevent licking: Use an Elizabethan collar (cone) or a recovery suit to prevent your pet from licking or chewing the incision. Licking is the most common cause of post-surgical complications.
  • Check the incision daily: Mild swelling and slight bruising are normal. The incision should look cleaner and drier each day.
  • Administer medications as prescribed: Pain medication and sometimes antibiotics will be provided. Complete the full course.
  • No baths: Keep the incision dry for the entire recovery period.

When to Call the Vet

Contact your veterinarian if you notice:

  • Significant swelling, redness, or discharge at the incision site
  • Opening of the incision
  • Lethargy persisting beyond 48 hours
  • Refusal to eat for more than 24 hours after surgery
  • Vomiting or diarrhea
  • Difficulty urinating or defecating
  • Pale gums or labored breathing

Common Myths

”My pet will get fat after being fixed.”

Spaying and neutering can slightly reduce metabolic rate, but weight gain is caused by overfeeding and insufficient exercise. Adjusting food portions and maintaining an active lifestyle prevents post-surgery weight gain.

”My female pet should have one litter first.”

There is no medical benefit to allowing a pet to have a litter before spaying. In fact, spaying before the first heat provides the greatest cancer prevention benefit.

”Neutering will change my dog’s personality.”

Your dog will still be the same individual. Neutering reduces hormonally driven behaviors like roaming and marking, but it does not alter their core temperament, affection, or energy level.

”The surgery is too risky.”

Spay and neuter procedures have an extremely low complication rate when performed by a qualified veterinarian. The long-term health risks of leaving a pet intact, including pyometra, mammary tumors, and testicular cancer, generally far outweigh the surgical risk.

Financial Considerations

The cost of spaying or neutering varies by location, clinic type, and the size of your pet. Many communities offer low-cost spay/neuter programs through shelters and nonprofit organizations. The one-time cost of the procedure is significantly less than the expense of treating reproductive cancers, pyometra, pregnancy complications, or caring for an unexpected litter.

For more information on keeping your pet healthy, browse our health guides and learn about vaccination schedules and dental care.