I have researched this topic frequently on neutering and spaying before 1 year. This was recently updated. I stand firm on my beliefs and concerned about the heelers health. You can prevent breeding with caution and monitoring breeding cycles. I will admit during those times it can get crazy but it's a healthy choice for your heelers. As a result of Buckeye being nuetured at 3 months he has been left with weakened bones. At 1.5 yrs he has frequently had sore joints from jumping and landing hard. The damage has been done by early nueturing..
Spaying or neutering dogs before skeletal maturity (often <1 year) can disrupt bone development, specifically by delaying the closure of growth plates. This causes long bones to become longer, changing joint angles and increasing the risk of orthopedic disorders like hip dysplasia, CCL tears, and elbow dysplasia, particularly in large breeds.
The Pet Hospitals
Key Impacts on Bone and Joint Health
Delayed Growth Plate Closure: Sex hormones (estrogen/testosterone) signal growth plates to close. Without them, bones grow longer, creating joint instability and increasing orthopedic risks.
Increased Orthopedic Risks: Studies show early sterilization (before 5.5–12 months) can double or triple the risk of hip dysplasia and Cranial Cruciate Ligament (CCL) tears.
Large Breed Vulnerability: Large and giant breeds (e.g., Golden Retrievers, Labradors) are more prone to these issues because their growth plates close later (up to 12-15 months or more).
Increased Cancer Risk: Early sterilization is also linked to a higher incidence of bone cancers like osteosarcoma.
Wellesley Veterinary Clinic
General Recommendations
Large Breeds: Veterinarians often advise waiting until 12–24 months (full skeletal maturity) to avoid joint issues.
Small Breeds: The risk to bone health is much lower in smaller dogs, allowing for earlier sterilization.
The Animal Hospital
While early spay/neuter helps control pet overpopulation and prevents certain cancers (e.g., mammary tumors), it is crucial to balance these benefits against the potential for long-term bone and joint issues in individual dogs.
Animal Humane Society