Here is some important information I found on altering while researching for this site.

Definitions:

Spay - Medical term is ovariohysterectomy. A surgical removal of the uterus and ovaries from the abdomen of a female animal.

Neutering - Also called castration is the surgical removal of the testicles from the scrotum of a male animal.

If you still think that spaying and neutering isn't necessary, please read on. Or you can email me.