The Quietly Changing Consensus on Neutering Dogs

In the 1970s, a time when tens of millions of unwanted dogs were being euthanized in the United States annually, an orthodoxy began to take hold: Spay and neuter early. Spay and neuter everything. It’s what vets were taught. It’s what responsible pet owners were told to do.

A growing body of research, however, suggests that spaying and neutering—especially in some large breeds when very young—are linked to certain disorders later in life. “As time has gone on, vets are starting to question the wisdom,” says , a veterinary epidemiologist with that found higher rates of obesity and orthopedic injury in golden retrievers that had been fixed. Other studies have linked early spaying and neutering to certain cancers, joint disorders, and urinary incontinence—though the risks tend to vary by sex, breed, and living circumstances. As such, the in a guide for veterinarians, “There is no single recommendation that would be appropriate for all dogs.”