Neutering typically refers to the surgical sterilization of the male. Neutering is performed under general anesthesia (your pet is completely unconscious). The testicles are removed completely through a small skin incision. Neutering is a fairly straightforward procedure and can help prevent certain health problems such as testicular cancer and prostate problems. It can also help to reduce or eliminate undesirable behaviours such as urine marking, certain types of aggression and roaming.