When Should You Spay or Neuter Your Puppy? Why We Recommend Waiting Until Physical Maturity
- Buffy McDonald
.png/v1/fill/w_320,h_320/file.jpg)
- Jul 22
- 5 min read
Updated for 2026 | McDoodles of Texas
One of the most common questions new puppy families ask is:
"When should I spay or neuter my puppy?"
For decades, the standard recommendation was simple—schedule the surgery around six months of age.
Today, however, veterinary research has evolved significantly. Many reproductive specialists, orthopedic veterinarians, and responsible breeders now recognize that there is no one-size-fits-all answer.
At McDoodles of Texas, we require our pet puppies to remain intact until at least 12 months of age, with female puppies completing one natural heat cycle before being spayed. We recommend completing the procedure between 18 and 24 months, and no later than 24 months unless otherwise discussed with your veterinarian.
This recommendation wasn't made lightly. It reflects years of studying current veterinary literature, consulting with reproductive veterinarians, and following ongoing research regarding canine development and long-term health.
Why Timing Matters
Your puppy's reproductive hormones are responsible for far more than reproduction.
Estrogen and testosterone help regulate normal development throughout adolescence, including:
Healthy bone growth
Proper growth plate closure
Joint development
Muscle formation
Ligament strength
Metabolism
Immune system function
Brain development
Emotional maturity
Removing these hormones too early interrupts a normal developmental process that nature designed to occur over the first year and beyond.
While spaying and neutering remain an important part of responsible pet ownership, the timing of the procedure may influence lifelong health.
What Has Changed?
For many years, early spaying and neutering were promoted primarily as a way to reduce pet overpopulation.
While population control remains extremely important, newer veterinary research has shifted the conversation toward individualized recommendations based on breed, size, sex, and lifestyle.
Organizations such as the World Small Animal Veterinary Association (WSAVA) now recommend that veterinarians evaluate each dog individually rather than applying the same recommendation to every puppy.
This represents a significant evolution in veterinary medicine.
Benefits of Waiting Until Physical Maturity
Although every dog is unique, allowing a puppy to mature naturally before sterilization may provide several important benefits.
Improved Orthopedic Development
Growth plates remain open while puppies are developing.
Reproductive hormones help signal these growth plates when it's time to close.
If hormones are removed too early, bones may continue growing longer than intended, potentially altering joint angles and body structure.
Researchers continue studying how this affects orthopedic health across different breeds.
For active companion dogs, hiking partners, agility dogs, and family pets alike, healthy joints matter for a lifetime.
Stronger Muscles and Ligaments
Hormones influence muscle development and connective tissue strength.
Allowing puppies to finish maturing naturally may contribute to improved muscle tone and normal ligament development.
These structures support healthy movement throughout life.
Healthy Body Condition
Hormones also play a role in metabolism.
Many owners notice that altered dogs require fewer calories and are more prone to weight gain.
Maintaining hormones during development may help puppies establish normal metabolic patterns before sterilization.
Emotional and Behavioral Maturity
Adolescence isn't only physical.
Just like people, dogs mature emotionally over time.
Many veterinarians believe allowing dogs to experience normal hormonal development may contribute to improved confidence and emotional maturity before surgery.
Proper socialization, positive training, and consistent routines remain the most important factors in raising a well-adjusted dog.
Why We Ask Female Puppies to Experience One Heat Cycle
One of the questions we receive most often is:
"Why do you require females to go through one heat?"
For our program, allowing one natural heat cycle supports the normal hormonal changes that occur during adolescence.
After the first heat, most females have reached a greater degree of skeletal maturity, making it an appropriate time to discuss surgery with your veterinarian.
Waiting until after the first cycle also aligns with our philosophy of allowing puppies to complete normal physical development before reproductive hormones are removed.
What About Mammary Cancer?
This is often the first concern families bring up.
Historically, early spaying was recommended because it reduces the lifetime risk of mammary tumors.
That information is still part of the conversation.
However, veterinary medicine now recognizes that the decision involves balancing multiple health considerations, including:
orthopedic health
endocrine function
breed predispositions
reproductive disease prevention
cancer risk
lifestyle
owner responsibility
There is no longer universal agreement that every puppy should automatically be spayed at six months.
Instead, veterinarians increasingly recommend individualized decision-making based on each dog's specific circumstances.
What About Male Dogs?
Our recommendation is the same. Male puppies should remain intact until at least 12 months, with our preferred timing being 18 to 24 months whenever practical.
Testosterone contributes to:
muscle development
bone density
growth plate closure
overall physical maturity
Allowing males to complete adolescence before neutering supports healthy development during this important stage of life.
Why This Matters for Cavaliers and Cavapoos
As Cavalier King Charles Spaniel enthusiasts, we pay close attention to current research involving spinal and orthopedic health.
Cavalier owners are increasingly aware of conditions such as Intervertebral Disc Disease (IVDD) and the importance of preserving healthy musculoskeletal development.
Although IVDD is a complex condition with many contributing factors—including genetics, body condition, and lifestyle—supporting healthy skeletal development during puppyhood is one piece of responsible lifelong care.
This is another reason we encourage families to discuss delayed sterilization with their veterinarian.
Responsible Ownership Still Comes First
Waiting to spay or neuter requires responsible management.
Families must:
Prevent accidental breeding.
Keep females securely contained during heat cycles.
Supervise intact males appropriately.
Follow local leash laws.
Maintain regular veterinary care.
Responsible ownership is the key to making delayed sterilization successful.
Why This Is Part of Our Contract
Every breeding decision we make begins years before a puppy is born.
Our parent dogs undergo extensive health testing, temperament evaluations, and careful pairing because we believe every puppy deserves the healthiest possible start.
Recommending delayed spaying and neutering is simply another extension of that commitment.
Our goal isn't simply to produce beautiful puppies.
Our goal is to help them become healthy companions for the next 12 to 15 years.
Our Recommendation
For puppies from McDoodles of Texas, we recommend:
✅ Wait until at least 12 months of age
✅ Female puppies should experience one natural heat cycle
✅ Our preferred timing is 18–24 months
✅ Complete the procedure before 24 months
✅ Work closely with your veterinarian to determine the best timing for your individual puppy
Final Thoughts
Veterinary medicine is continually evolving, and so are we. As ethical breeders, we stay informed about emerging research so we can provide families with recommendations that reflect current knowledge—not outdated routines.
Delaying spay or neuter is not about avoiding sterilization. It is about giving your puppy the opportunity to benefit from the hormones that support healthy growth and development before those hormones are removed.
Every dog is unique, and every family should make this decision in partnership with a trusted veterinarian. Our role is to provide education, share the research that has informed our program, and support you throughout your puppy's life.
At McDoodles of Texas, our commitment doesn't end when your puppy goes home—it lasts a lifetime.
References
Our recommendations are informed by current reproductive veterinary research and guidance from organizations and experts including:
Comments