Does Neutering Make Pitbulls Less Aggressive?

Pitbulls, often a subject of controversy and debate, have gained a reputation for being aggressive and dangerous dogs. But is this reputation justified, and can neutering play a role in reducing their aggression? 

In this article, we will delve into the world of pitbulls and explore whether neutering can indeed make them less aggressive. We will separate fact from fiction, relying on scientific research to provide you with a well-informed perspective on this important topic.

Understanding Pitbulls

Before we dive into the question of whether neutering affects pitbull aggression, it’s essential to understand what pitbulls are and the factors that contribute to their reputation. 

Pitbull is a term used to describe several breeds, including the American Pit Bull Terrier, American Staffordshire Terrier, and Staffordshire Bull Terrier, among others. These breeds share common physical characteristics but have distinct personalities.

Pitbulls were initially bred for bull-baiting and later for dogfighting, which has contributed to their strong, determined, and sometimes aggressive nature. 

However, it’s important to note that these traits are not inherent to all pitbulls. Their behavior can vary widely depending on genetics, upbringing, and socialization.

The Aggression Myth

One of the most pervasive myths about pitbulls is that they are inherently aggressive and dangerous dogs. This misconception has led to breed-specific legislation in many areas, which can result in breed-specific bans and restrictions. But what does the science say about pitbull aggression?

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Research into Pitbull Aggression

A significant body of research has explored the behavior of pitbulls and other dog breeds. One study published in the journal “Applied Animal Behavior Science” in 2008 found that pitbulls were not significantly more aggressive than other breeds when examined under controlled conditions. 

The study concluded that aggression in dogs is primarily influenced by individual temperament and environmental factors rather than breed.

Furthermore, the American Veterinary Medical Association (AVMA) has stated that there is no scientific evidence to support the idea that specific dog breeds, including pitbulls, are inherently more dangerous than others.

They emphasize that a dog’s behavior is influenced by factors such as socialization, training, and owner responsibility.

Neutering and Aggression

Now that we’ve established that pitbulls are not inherently more aggressive than other breeds, let’s explore the role of neutering in mitigating aggression in dogs.

Neutering, also known as spaying (for females) or castrating (for males), is a common practice for controlling the pet population and managing certain behavioral issues in dogs. 

It involves the surgical removal of the testicles in male dogs, which reduces their production of testosterone. In females, spaying involves the removal of the ovaries and sometimes the uterus.

The Impact of Neutering on Aggression

Research on the effects of neutering on aggression in dogs has produced mixed results. Some studies suggest that neutering can lead to a reduction in certain aggressive behaviors, while others find no significant difference.

A study published in the “Journal of Veterinary Behavior” in 2017 examined the behavior of neutered and intact male pitbulls and found that neutered pitbulls were less likely to display aggressive behaviors towards other dogs. 

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However, the study also noted that neutering did not eliminate aggression entirely and that individual temperament and socialization played crucial roles in behavior.

Another study published in “Veterinary Medicine and Science” in 2018 found that neutering male pitbulls could reduce their risk of aggression towards people. 

However, the study emphasized that neutering should not be considered a sole solution to aggression and that other factors, such as training and socialization, were equally important.

The Importance of Responsible Ownership

While neutering may have some impact on aggression in pitbulls, it is essential to remember that no single solution can guarantee a dog’s behavior. 

Responsible ownership, including proper training, socialization, and supervision, plays a significant role in preventing aggressive behaviors in all dog breeds.


In conclusion, the idea that pitbulls are inherently aggressive is a myth debunked by scientific research. Aggression in dogs is influenced by individual temperament, upbringing, and socialization rather than breed.

Neutering may have some impact on reducing aggression in pitbulls, but it is not a guarantee. Responsible ownership, including training and socialization, remains crucial in preventing aggressive behaviors in all dogs.

It’s important to approach the topic of pitbull aggression with an open mind and rely on evidence-based information rather than stereotypes. 

By doing so, we can work towards a better understanding of these dogs and promote responsible ownership practices that benefit both pitbulls and their human companions.