A lot of so called breeders get caught up in the "HYPE" of becoming rich by breeding dogs, and selling puppies. Well, let us be the first to tell you that it is just that, "HYPE". What separates those who are successful through breeding from those who are unsuccessful, is that the successful breeders aren't in it for the money. They have a bigger vision, which is to produce quality dogs, and enhance the breed. Most successful breeders don't breed more than twice a year, because they understand that female dog pregnancy carries serious risks that shouldn't be taken lightly. There are many things that can go wrong during the her pregnancy that could put not only the pups life at risk, but the mother as well. Unless the mother has proven to produce high quality, physically correct, healthy pups on a consistent basis, additional breedings are not worth the risk.
Breeding shouldn't even be considered until your female dog is at least two years of age. This will ensure that she is mature, and can get full health clearance. It is also good practice not to breed your female in back-to-back heat cycles. Not only does this raise your risk as far as health goes, but ethically it is just not right. If you breed a female dog every single time she comes in heat, when does she ever have the time to just be a dog? From the pregnancy to the whelping of the pups, to raising a litter, a mother can get overwhelmed, and stressed. Some breeders will argue that there are times when it is ethical to do a back-to-back breeding. But from experience, most breeders who feel the need to get as many breeding's as possible, do not have the best interest of the breed in mind.
Good breeders do health testing, take dogs back when necessary, and treats every dog like one of the family. Any breeder who consistently breeds the same female dog, regardless of the fact that the pups she is producing are of lower quality than the breed standard, is overbreeding and is only in it for the money. Take your time when doing research for a reputable breeder. They are out there. Nine times out of ten, if they interview you before giving you a pup, they offer a health guarantee, and want you to keep in touch to see how your pup is developing, they are a good breeder. Beware of overbreeders, they will sell you an unhealthy pup, and disappear in the wind with your money.