Helpful Definitions

Neuter:  To desex or render an animal unable to reproduce;  castration for males and ovariohysterectomy (spay) for females.

Intact:  An animal that has not been neutered.

Tom cat:  A male cat that has not been neutered.

In Heat or Estrus:  The time during the reproductive cycle in animals when the female is receptive to males.

Pheromones:  A substance secreted to the outside of the body and is smelled by and causes particular behavior in others of the same species.