Differences in Sexual Maturity
In the past, most veterinarians recommended that dogs be spayed or neutered between five and eight months of age. However, more recent studies have led to updated guidance. Today, many veterinary professionals suggest waiting until at least ten months of age before sterilization, especially in large breeds like the Golden Retriever. If a family chooses to delay the procedure, it is important to be aware of the behavioral and physical changes that may occur as a dog reaches sexual maturity.
Females
Most female Golden Retrievers will experience their first heat cycle between seven and ten months of age. During this time, you may notice some light bleeding and a few mood changes. A female in heat may become slightly more reserved, less tolerant, or more territorial. Some females also prefer extra space and quiet during this phase.
It is also common for females to begin marking. Unlike males, females do not lift their leg, but they may still mark areas by squatting multiple times in different spots around the yard. This is normal hormonal behavior and should not be confused with incomplete house training.
During her heat cycle, it is best to avoid playdates with unfamiliar dogs, as her mood and receptiveness to social interactions may change. Once the heat cycle ends, she will typically return to her normal temperament. After a spay procedure, these hormonal fluctuations will no longer occur, and many females become more stable in mood. The removal of estrogen can also have a slight calming effect in some dogs.
Males
Male Golden Retrievers can reach sexual maturity as early as seven months of age. This does not mean every male will immediately begin marking or showing dominant behaviors, but it is a possibility. Marking is often influenced by the presence of other intact males or females in the home or neighborhood.
One behavioral concern with intact males is the tendency to wander. Once mature, a male may become more driven to seek out a female in heat. If left unattended in an unsecured yard or off-leash in an open space, the urge to roam can lead him away. For this reason, it is important to supervise intact males closely until they are neutered.
Marking may or may not stop after neutering. If a male begins marking before he is altered, the behavior can continue out of habit. At that point, it becomes a training issue. It is the owner’s responsibility to teach appropriate behavior—marking outside on a tree may be acceptable, but marking furniture indoors is not.
However, the tendency to roam or show sexual behaviors usually decreases significantly after neutering, as the hormonal drive to breed is removed.
Understanding these stages is a key part of preparing for life with a Golden Retriever, and I always encourage open communication with both your veterinarian and your breeder to determine the best time for spay or neuter, based on your dog’s needs and your family’s goals.