Reasons to neuter male dogs include a reduction in aggressive behaviors, medical benefits and helping to control the homeless pet population, according to the ASPCA. Medical benefits of neutering male dogs include eliminating the chance of testicular cancer and reducing the number of prostate problems.
Neutering a male dog reduces the level of testosterone in the system and often leads to better behavior, states the ASPCA. Although behavioral change is not guaranteed and depends largely on the individual dog, neutered dogs are less likely to attempt to mount other dogs or people, and they are less likely to try and escape to find a mate. The usual age to neuter male dogs is between six and nine months.