One of the most important behavioral advantages of castration is that as adults, these neutered cats will tend to be less aggressive toward other cats. Spraying urine is a normal sexual behavior of uncastrated male tomcats. Anyone who has smelled tomcat urine will quickly agree that spraying is a very unwanted behavior. Some unspayed and spayed females, and some castrated males, will spray, but it is much more common in unneutered males. Another behavioral advantage of neutering is that neutered cats are much less likely to react when they sense a female in heat.
Male cats can sense females in heat through pheromones.
These are airborne chemical attractants that are liberated from the female when she is cycling. They travel through the air for great distances. Male cats neutered at an early age will generally not sense or respond to pheromones, and would certainly be less stressed and tend to stay home if they are outdoor cats. Medical Advantages There are numerous behavioral and medical benefits to neutering your cat. The biggest medical advantage to neutering cats is really related to their behavior.