Having your dog 'fixed' can help to curb undesirable behaviors such as roaming, mounting and animal aggression. Spaying and neutering may also offer your dog a number of health benefits such as: It reduces the risk of prostate and other cancers. Can reduce marking and spraying issues. It stabilizes the mood of the dog. Your dog may have a reduced urge to mate. It can reduce sexualized behaviors. This can help decrease aggressive behaviors.