Motivated by the desire to find an alternative to spaying (ovariohysterectomy), which removes healthy organs for a healthy female cat, I explored different alternatives to prevent the unwanted behavior of female cats in heat and to prevent unwanted litters. I found that it was known by some veterinarians that when they collected cell samples from the vaginal cavity of female cats, that this procedure sometimes induced accidental ovulation. This ovulation in turn ends the unwanted behavior and frees unfertilized eggs, which will remain unfertilized because the female is no more responsive to males. Some cat breeders, who would not spay their queens, use sterile males to induce ovulation and relieve the females from the stress of their heat period. I invented an ovulator to substitute a sterile male or a veterinarian's instrument to use in precise conditions and following a detailed method to stimulate ovulation and cause the ovulation to initiate a pseudo-pregnancy, stop the hear behavior and prevent unwanted litters. Spaying is a mutilation of healthy organs on healthy animals. My ovulator and method offer an alternative to cat owners whom presently only have a choice between unwanted litters or enduring the disagreeable heat behavior and on the other side, a major operation on a healthy animal.