How Long After Neutering Does Testosterone Drop?

How Long After Neutering Does Testosterone Drop

How Long After Neutering Does Testosterone Drop?


Neutering is a common surgical procedure performed on male dogs to remove their testicles. This procedure, also known as castration, is mainly done to control pet overpopulation and prevent unwanted behaviors such as roaming, aggression, and marking territory. However, one question that often arises is how long it takes for testosterone levels to drop after neutering. In this article, we will explore the timeline for testosterone drop after neutering and address some frequently asked questions regarding this topic.

Understanding the Neutering Process:

Before we dive into the timeline of testosterone drop after neutering, it’s essential to understand the neutering process itself. Neutering involves removing a male dog’s testicles, which are responsible for producing testosterone, the primary male sex hormone. Without the testicles, the production of testosterone significantly decreases, leading to various behavioral and physiological changes in the dog.

Timeline for Testosterone Drop after Neutering:

Immediately after the neutering procedure, your dog’s testosterone levels will still be relatively high. However, the actual drop in testosterone levels typically occurs within the first few weeks post-surgery. It’s important to note that the exact timeline may vary depending on individual factors such as age, breed, and overall health.

1. First Week after Neutering:

During the first week after neutering, your dog may experience some discomfort and tenderness in the surgical area. This is completely normal and can be managed with pain medication prescribed by your veterinarian. Testosterone levels may still be relatively high during this time, as the body needs time to adjust to the changes.

2. Second Week after Neutering:

By the second week after neutering, testosterone levels should start to decrease significantly. You may notice behavioral changes in your dog, such as reduced aggression, less frequent marking, and a decreased interest in mating. These changes are a result of the decreasing testosterone levels in your dog’s body.

3. Third Week after Neutering:

During the third week after neutering, your dog’s testosterone levels should continue to drop. At this point, you may notice further improvements in behaviors related to territorial marking and aggression. Your dog may become calmer and more focused, making training sessions more effective.

4. Fourth Week after Neutering and Beyond:

By the fourth week after neutering, your dog’s testosterone levels should have reached a minimal level. At this stage, you should observe a significant reduction in unwanted behaviors associated with intact males. However, it’s important to remember that individual variations exist, and some dogs may take longer for their testosterone levels to fully diminish.

Frequently Asked Questions (FAQs):

1. Will neutering my dog completely eliminate aggressive behavior?

Neutering can help reduce aggressive behavior in dogs, but it may not completely eliminate it. Aggression can be caused by various factors, including genetics, socialization, and past experiences. Neutering can be a valuable tool in managing aggression, but training and behavioral interventions may still be necessary.

2. Can neutering cause weight gain in dogs?

Neutering alone does not directly cause weight gain in dogs. However, after neutering, dogs may experience a decrease in their metabolic rate, which could lead to weight gain if their diet and exercise routine are not adjusted accordingly. It’s important to monitor your dog’s weight and consult with your veterinarian to ensure a healthy weight management plan.

3. Will neutering affect my dog’s energy level?

Neutering may cause a slight decrease in energy levels in some dogs. This is because testosterone plays a role in promoting certain male behaviors, including high activity levels. However, the impact on energy levels varies among individuals, and many neutered dogs continue to lead active and energetic lives.

4. Can neutering change my dog’s personality?

Neutering can bring about some changes in a dog’s behavior and personality. Most commonly, neutered dogs tend to become calmer and more focused. However, it’s important to note that the dog’s underlying personality traits will remain intact, and neutering will not alter fundamental aspects of their temperament.


Neutering is an important procedure that can help control pet overpopulation and manage various behavioral issues in male dogs. Understanding the timeline for testosterone drop after neutering is crucial for pet owners, as it allows them to have realistic expectations regarding behavior changes. Remember, every dog is unique, and individual variations may exist. If you have any concerns or questions about your dog’s neutering process, consult with your veterinarian for personalized advice and support.

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