Neutering, which is the surgical removal of a male dog's testicles or a female dog's ovaries and uterus, can have various effects on dog behavior. In male dogs, neutering can help reduce aggressive behavior, roaming tendencies, and marking behavior. It can also decrease the likelihood of certain health issues like testicular cancer. However, neutering may not completely eliminate behavioral issues that are already established. In female dogs, spaying can prevent heat cycles, reduce the risk of mammary tumors, and eliminate the chance of uterine infections. It can also decrease the likelihood of certain behavioral problems like aggression and roaming. It's important to note that the effects of neutering on behavior can vary depending on the individual dog. It's always best to consult with a veterinarian to determine the best course of action for your pet.

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Topics covered in this question:

Dog Behavior Aggression Spaying Neutering Health Benefits