Is it too late to have your dog spayed or neutered? Explaining the best time

Some pet owners may be considering having their pet spayed or neutered. But, are you wondering when is the best time to do so? Especially for newly adopted puppies, some owners may have been asked by their veterinarian during vaccinations.

This article explains the best time to spay or neuter your pet. Please use this information as a reference when consulting with your veterinarian.

Is neutering dogs mandatory?

Spaying your dog is not mandatory, as its purpose is to prevent unwanted pregnancy.

However, if you are not planning on breeding your dog, neutering has many benefits, including reducing the stress of estrus and the risk of illness in senior years. Therefore, neutering is veterinarily recommended. Spaying involves the removal of the ovaries and uterus, preventing diseases that are believed to occur in these areas. It can also prevent mastitis and mammary tumors, which are caused by the influence of female hormones.

Though neutering is not mandatory, it is important to consider it for your dog's health and, above all, to prevent the loss of a life due to unwanted pregnancy.

Recommended Time for Spaying/Neutering

Spaying a dog is performed under general anesthesia. This can be stressful for young puppies and older dogs. However, it's said that the timing of the surgery can affect the effectiveness of disease prevention, so determining the right timing is important.

Here, we'll explain the benefits of spaying and neutering at different times and how to determine the appropriate time.

For disease prevention, perform the procedure by around 6-9 months of age

Many owners have reported that when they brought their beloved dog home as a puppy and took it to the vet for vaccinations, the veterinarian spoke to them about spaying or neutering.

Especially if you are not planning on breeding, it is recommended that you have your dog spayed or neutered before its first heat to prevent diseases such as mammary tumors. Generally, the first heat occurs between 6 months and 1 year of age, so it's ideal to have your dog spayed or neutered before then, between 6 and 9 months of age. Larger breeds mature more slowly, so spaying or neutering is recommended a little later.

On the other hand, underdeveloped puppies under 3 months of age and senior dogs should be avoided, as anesthesia and surgery can be very stressful.

Does the timing of spaying or neutering affect the incidence of disease?

The disease prevention effectiveness of spaying may vary depending on whether your dog has already gone into heat.

For example, in the case of mammary tumors, surgery before the first heat is said to have a preventative effect of approximately 99% and after two heats, approximately 74%. During this period, the incidence of mammary tumors increases sharply from approximately 1% to approximately 26%. Thus, the timing of spaying is very important.

If you have decided to have your dog spayed, consider having it done before the first heat.

Can't surgery be performed during estrus?

Your dog may go into estrus just before surgery. If this occurs, it's best to postpone the spay/neuter procedure. During estrus, the uterus becomes swollen and congested, increasing the risk of bleeding during surgery. Also, changes in hormone balance can cause the dog to become unwell.

With advances in technology, more and more hospitals are now able to perform spay/neuter procedures even during estrus. However, considering your dog's physical condition, we recommend observing the condition for about a month after the estrus bleeding.

Does it become meaningless after this period?

The incidence of disease may vary depending on the timing of spaying.

For example, in the case of mammary tumors, the disease prevention effect of spaying decreases with each estrus, and it is said that the preventive effect against malignant mammary tumors is almost nonexistent after the age of 2.5. The risk of uterine infections can also be reduced by spaying before the age of 4.

As such, spaying at a young age can be expected to be more effective in preventing disease.

However, there is no rule that says that spaying or neutering must be performed by a specific time. In fact, pyometra, which is common in senior dogs, is said to be effective even when performed at 5 or 6 years of age, before the dog reaches seniorhood. However, since spaying or neutering is performed under general anesthesia, performing the procedure at a young age when the dog is still strong and healthy allows for a faster recovery after surgery, which is also reassuring for owners.

Summary: The optimal time for spaying or neutering varies from dog to dog, so consult your veterinarian!

Many pet owners wonder whether they should have their pet spayed or neutered under general anesthesia. Deciding the right timing can also be difficult.

Spaying your pet as young as possible is recommended, not only to prevent unwanted pregnancy but also to prevent disease. However, the appropriate timing varies depending on your pet's breed, constitution, and physical condition.

Please consider the benefits of spaying and neutering described here and consult with your trusted veterinarian to determine the best time for your pet.