This article is from the rec.pets.dogs: Breeding Your Dog, posted to rec.pets.dogs newsgroup. Maintained by Cindy Tittle Moore with numerous contributions by others.
This is flat out wrong. Bitches are not improved by having puppies. They may undergo _temporary_ temperament changes, but once the puppies are gone, she'll be back to her old self. Nor is it somehow good for her physically. In fact, you will put her at risk of mammary cancer and pyometra. There is absolutely nothing wrong with spaying a bitch without her having a litter.