Breeding is a labor of love. First and foremost is your dog purebred? If she is, she needs to be tested in some manner to prove her working ability and temperament around stressful situations. A lot of people use schutzhund and herding, some use other sports. Ideally the dog would be shown as well, to how well they match up against the written standard. After that there's health testing, Hip, elbows, and some folks submit the DM testing. These hip and elbow x-rays need to be evaluated by either the SV or OFA, the score should be fair, good, or excellent to prove you are breeding sound animals. Tf all else checks out you then have to learn to read pedigrees, and find a mate whose bloodlines will cross well with your dogs. Some bloodlines blend beautifully, some are train wrecks when they are combined. It's a lot of work to breed in a manner that betters the overall gene-pool.