Spaying stops the queen's frantic interest to roam outdoors and reduces the chances she will mark your home with urine when she is in heat. Unaltered cats have urges that make them irritable and upset. They yowl or whine non-stop, fight, or destroy objects in the house. Neutering a tomcat reduces his risk of prostate problems, including cancer, later in life. Neutering lowers the tomcats urge to roam and to fight, and thus lowers chances of disease transmission and woundings.
Neutering reduces the tomcats tendency to spray in the home.
Neutering eliminates the powerful odor of the tomcats urine.