The benefits of spaying and neutering pets affect medical and behavioral issues with pets as well as having an impact on communities. 

For pets, the medical and behavioral issues include the following:

• Spayed and neutered pets tend to have longer and healthier lives.
• Neutering reduces, and in some cases eliminates, the urge for male cats to spray and mark their territory.
• Pets will be less likely to leave home and roam the neighborhood, which could lead to fights with other males. Staying home versus roaming also protects them from traffic accidents.
• Neutering may reduce the risk of testicular cancer.
• Spaying reduces the chance of mammary cancer and eliminates the risk of cancer to the uterus and ovaries.
• Neutered canines tend to be less aggressive and have a calmer disposition.
• Once spayed, females will no longer go into the heat cycle.
• Unwanted pregnancies are avoided.