Many people have been led to believe that neutering male dogs is essential to eliminating aggression and other unwanted territorial behaviours, but I have not found that to be necessarily true. (animalkindvet.com)
This surgical procedure can also help to decrease territorial behaviours. (petsmagazine.ca)
Behavioural — Pets are less prone to wander, fight, and are less likely to get lost or injured — Reduces territorial behaviour such as spraying indoors. (thearkvet.com)