Double the Poochons, Double the Trouble (and Double the Love!)
Deciding whether to spay (for females) or neuter (for males) your dog is one of the most important healthcare choices you will make as a pet parent.
For decades, standard advice was to spay or neuter every dog as early as six months old. However, modern veterinary medicine has introduced a more nuanced perspective. While fixing your pet offers major health and behavioral benefits, some veterinary experts now suggest weighing the risks and timing based on your dog's specific breed, size, and lifestyle.
Here is a complete look at why spaying and neutering are recommended, the potential downsides, and why expert opinions are shifting.
For the majority of family dogs, spaying or neutering provides life-saving medical advantages and prevents behavioral challenges:
Prevents Uterine Infections (Pyometra): Pyometra is a severe, life-threatening infection of the uterus affecting up to 25% of unspayed female dogs. Spaying completely eliminates this risk.
Reduces Cancer Risks: Spaying before a female’s first heat cycle significantly reduces the risk of mammary gland (breast) cancer. Neutering males prevents testicular cancer and drastically reduces prostate disease.
Prevents Unplanned Litters: It eliminates accidental pregnancies, helping reduce animal shelter overcrowding.
Reduces Roaming & Escaping: Intact dogs (especially males) often try to escape or wander off to locate a mate, putting them at high risk for car accidents or getting lost.
Calms Marking & Mounting: Neutering reduces territory-marking with urine inside the home and lowers sexually driven behaviors like mounting or dominance aggression toward other male dogs.
In recent years, veterinary researchers—including experts at the UC Davis School of Veterinary Medicine—have published studies showing that surgical sterilization isn't a simple "one-size-fits-all" procedure.
Here are the main reasons some experts advise against early spaying/neutering or suggest waiting:
Sex hormones (estrogen and testosterone) play a critical role in guiding how a puppy's bones and joints grow and close.
Removing these hormones too early (before growth plates close at 12–24 months) can lead to longer legs, altered joint angles, and an increased risk of hip dysplasia or ACL/CCL ligament tears, particularly in large or giant breeds (like Golden Retrievers, Labradors, and German Shepherds).
While spaying/neutering reduces reproductive cancers, early hormone removal has been linked to a slightly higher incidence of other specific cancers in certain breeds, such as hemangiosarcoma (blood vessel cancer), osteosarcoma (bone cancer), and lymphoma.
Sterilized dogs have a lower metabolic rate and burn fewer calories. If their diet isn't adjusted after surgery, they are at a higher risk for obesity, which puts extra strain on joints and heart health.
Because of these findings, most experts do not say "never spay or neuter"—instead, they advocate for customized timing:
| Dog Size / Type | Recommended Timing | Why? |
| Small & Toy Breeds (e.g., Bichon, Poodle, Chihuahua) | Around 6 to 9 months | Their growth plates close quickly, and joint complications are very rare. Early spaying/neutering remains highly beneficial. |
| Large & Giant Breeds (e.g., Retrievers, Shepherds, Mastiffs) | Wait until 12 to 24 months | Allows full skeletal growth, protecting joints and ligaments while still providing long-term health protections. |
Spaying or neutering remains one of the best choices for preventing severe infections, cancers, and roaming behaviors. However, the decision should be tailored to your dog's individual breed, size, and health history.
Consult your veterinarian to create a personalized timeline that maximizes the benefits while protecting your dog's long-term joint and metabolic health!