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Do Puppies Calm Down After Being Spayed?

Do Puppies Calm Down After Being Spayed?

General Tips

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Owners

Learn how spaying affects puppy behavior and whether puppies calm down after the procedure.

By 

Sustainable Vet Group

Updated on

July 17, 2026

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This article is for informational purposes only and is not a substitute for professional veterinary advice. Every case is unique, so always consult your veterinarian for guidance specific to your pet.

This content is intended for veterinary professionals for educational purposes. It does not replace clinical judgment or tailored advice. Always rely on your training, expertise, and the specific context of your patients.

Do Puppies Calm Down After Being Spayed?

Spaying a puppy and expecting her to calm down afterward is one of the most common expectations owners bring to the vet. Sometimes it is accurate. Often it is not quite right.

Puppies behave the way they do for several reasons: genetics, breed characteristics, developmental stage, exercise needs, and yes, hormones. Spaying addresses only the hormonal piece.

Here is what the evidence actually says about whether spaying calms puppies down, when it applies, and when it does not.

 

Quick answer: Spaying can reduce hormone-driven behaviors in female puppies, but most puppy energy is not hormone-driven. The wild, excitable behavior typical of young dogs is largely developmental and will naturally settle as the puppy matures, with or without surgery. Spaying eliminates heat cycle behaviors but does not reprogram a puppy's underlying energy level or temperament.

 

Key takeaways

  • Most puppy energy is developmental, not hormonal: High activity in puppies reflects youth and brain development, not reproductive hormones.
  • Heat cycle behaviors are eliminated by spaying: Restlessness, roaming, and urine marking during heat stop permanently after spaying.
  • Natural maturation also produces calming: Puppies typically settle between 18 months and 3 years regardless of spay status.
  • Timing of spaying affects long-term behavioral outcomes: Research suggests very early spaying may increase fearfulness in some dogs.
  • Training and exercise calm puppies more reliably than surgery: These remain the primary tools for managing puppy behavior.
  • Full post-spay hormonal adjustment takes two to three months: Not days.

Why puppies are energetic in the first place

Before connecting spaying to calming, it is worth understanding why puppies behave the way they do.

Puppy behavior is driven by several overlapping factors:

  1. Developmental stage: Puppies are neurologically immature. Their brains are still forming connections, their impulse control is limited, and they are driven to explore, play, and interact constantly.
  2. Breed genetics: A Border Collie puppy's drive, a Labrador's enthusiasm, a Jack Russell's intensity: these are genetic. They are not hormonal.
  3. Exercise and stimulation needs: Puppies that are not adequately exercised and mentally engaged redirect that energy into chaos.
  4. Learning and socialization: Puppies are in a constant state of learning. Without clear guidance, they default to whatever feels interesting.
  5. Hormonal influences: A relatively small proportion of puppy behavior is directly driven by reproductive hormones, and this increases as the puppy approaches sexual maturity.

Spaying addresses only item 5. Items 1 through 4 are untouched by surgery.

What spaying actually removes in a female puppy

Spaying removes the ovaries, which are the primary source of estrogen and progesterone. The effects are specific.

What spaying eliminates:

  • Heat cycles, which in female dogs typically begin around 5 to 6 months of age in small breeds and later in large breeds
  • The behavioral disruption of heat: restlessness, urine marking to attract males, roaming, vocalization
  • False pregnancy cycles if the puppy would have been prone to these
  • Cyclical mood changes linked to the hormonal fluctuations of estrus

What spaying does not eliminate:

  • Breed-driven energy and drive
  • Developmental excitability and poor impulse control that comes with youth
  • Learned behaviors from the puppy's environment and training history
  • Anxiety or fearfulness that has non-hormonal causes

The natural calming process: maturation

Here is a piece of the puzzle that often gets overlooked in the conversation about spaying and calming.

Puppies naturally become calmer as they mature.

Most dogs reach a noticeably more settled behavioral baseline between 18 months and 3 years of age. This happens regardless of spay status. The neurological development that improves impulse control, the reduction of developmental chaos, and the establishment of routines all contribute to this natural calming process.

 

Many owners who spay a puppy and then notice she is calmer six months later attribute the change to the surgery. In many cases, maturation deserves significant credit.

 

This is not to dismiss the real effects of spaying. It is to provide accurate context so that owners do not overestimate surgery's role or underestimate the contribution of time, training, and maturation.

What research says about puppies and spaying

The behavioral research on early spaying and puppies is worth understanding before making timing decisions.

Established findings:

  • Spaying before the first heat cycle eliminates heat-related behaviors and reduces mammary cancer risk significantly.
  • Behavioral problems were reduced or eliminated in the majority of spayed females in studies, but this applies primarily to hormone-driven behaviors.

More cautionary findings:

  • Multiple studies have found that dogs spayed at a very young age, particularly before six months, show higher rates of fearfulness and anxiety than dogs spayed later.
  • A study of Vizslas found that the younger the dog at the time of spaying, the earlier the mean age of onset of a behavioral disorder.
  • Research using the C-BARQ assessment tool found increased fearfulness and touch sensitivity in spayed dogs compared to intact females.

These findings do not mean spaying causes behavioral problems in all puppies. They mean that very early spaying carries a different behavioral risk profile than spaying after maturity, and this is worth discussing with your vet when deciding on timing.

For the broader picture of full overview of behavior changes after spaying, including how the research applies to different ages and sexes, that guide provides the complete context.

Breed differences: why some puppies stay energetic after spaying

Breed temperament and genetic drive are not hormonal. Surgery does not change them.

A working Border Collie will need two hours of physical and mental exercise daily after spaying, just as she did before. An Australian Shepherd's herding instinct will remain intact. A Jack Russell Terrier's prey drive and intensity will not be reduced by the removal of her ovaries.

High-drive breeds are that way because of generations of selective breeding for those traits. Those traits sit in genetics, not in the reproductive system.

What this means practically:

If you have a high-energy breed puppy and are hoping spaying will reduce her energy to more manageable levels, realign those expectations before surgery. The energy level will remain. What changes is the absence of heat cycles and their associated disruption.

The timeline: when do puppies settle after spaying?

Two separate timelines operate here, and distinguishing them is important.

Post-spay hormonal adjustment:

  • Days 1 to 14: Recovery from surgery. Any behavioral changes reflect pain and anesthesia.
  • Weeks 2 to 6: Estrogen and progesterone levels declining.
  • Months 2 to 3: Hormonal stabilization complete.

Developmental maturation:

  • 6 to 12 months: Peak puppy chaos in most breeds.
  • 12 to 18 months: Gradual improvement in impulse control and ability to settle.
  • 18 months to 3 years: Most dogs reach a noticeably more settled behavioral baseline.

The calming that owners observe after spaying a puppy is often a combination of both timelines working together. The hormonal adjustment contributes. Maturation contributes. Exercise and training contribute. It is rarely attributable to surgery alone.

For the developmental nuances specific to younger dogs, the guide on calming effects in adult dogs covers the broader behavioral picture across different life stages.

What actually calms a puppy down

Whether or not your puppy is spayed, these are the most reliable interventions for managing puppy behavior:

1. Adequate physical exercise

A puppy that has genuinely burned physical energy is a calmer puppy at rest. Exercise needs vary by breed but most puppies are under-exercised relative to their needs.

2. Mental stimulation

Puzzle feeders, sniff walks, training sessions, and enrichment activities tire puppies in a way that physical exercise alone does not. Mental fatigue produces genuine calm.

3. Sleep

Puppies need significantly more sleep than adult dogs, often 16 to 18 hours per day. Over-tired puppies become dysregulated and difficult. Enforced rest periods reduce chaos.

4. Consistent training

Teaching a puppy to settle on a mat, to wait before doors, to sit before meals: these habits build impulse control that transfers across contexts. Training is the most durable path to a calm puppy.

5. Routine

Predictable daily schedules reduce ambient anxiety and help puppies know what to expect, which supports more settled behavior.

Spaying can contribute by removing the hormonal disruption of heat cycles. But it is most effective as one part of this picture, not as a standalone solution.

Frequently asked questions

Will my puppy calm down after being spayed?

She may become calmer in specific ways: heat cycle behaviors will be eliminated, and the cyclical hormonal disruption of estrus will stop. Whether she becomes generally calmer depends on what is driving her behavior. Developmental energy and breed-specific drive are not affected by spaying. For the best age to spay a puppy and how timing affects both health and behavioral outcomes, that guide covers the evidence-based timing recommendations in detail.

My puppy is three months old and incredibly wild. Should I spay her now to calm her down?

Spaying a puppy that young is unlikely to calm her down because the energy she is displaying is developmental, not hormonal. Female puppies typically do not experience their first heat until 5 to 6 months of age at the earliest. Spaying before that will not eliminate hormonal behavior because it has not yet started. What will help is exercise, training, mental stimulation, and sleep.

How long after spaying will my puppy start to calm down?

If the calming effect is going to occur, behavioral changes related to hormone reduction appear over two to six weeks and stabilize by two to three months. Any calming that happens faster than this is likely related to recovery rest and routine, not hormonal adjustment.

My puppy was spayed and she is just as hyper as before. Why?

Because spaying removes the hormonal layer of behavior, not the developmental and breed-driven layers. If her energy and excitability are not heat-driven, spaying was never going to address them. Training, exercise, and maturation are the tools for this type of puppy behavior.

What should I expect during my puppy's recovery from spaying?

The 10 to 14 day recovery period requires activity restriction, E-collar use, and daily incision monitoring. For a complete day-by-day guide on what to expect during puppy recovery, including how puppy recovery specifically differs from adult dog recovery, that guide covers every element of the post-surgical window.

Puppies are not energetic because of estrogen. They are energetic because they are puppies. Spaying addresses the hormonal layer of behavior, which for a young dog has barely had time to develop before surgery. The wild, chaotic, wonderful energy of a puppy is developmental. It settles with time, training, exercise, and maturation. Spaying contributes by preventing heat cycles and the disruption they bring. The rest of the work is yours.

Resources

The following sources were used as reference and background for this article:

  • American Kennel Club. How Will Spaying Change My Dog? anasazivet.com
  • Stanley Coren, Psychology Today. Are There Behavior Changes When Dogs Are Spayed or Neutered? psychologytoday.com
  • Rebarkable. Do Puppies Calm Down After Being Spayed? rebarkable.com
  • American Veterinary Medical Association (AVMA). Spaying and Neutering. avma.org
  • PubMed. Changes in the behavior of dogs after castration. pubmed.ncbi.nlm.nih.gov

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