The German Shepherd Dog Club of America (GSDCA) recommends that breeders should only use dogs with a hip score of OFA Good or better for breeding. The OFA (Orthopedic Foundation for Animals) hip score is a numeric evaluation of the hip joints, and it is based on X-rays that are taken when the dog is between 2 and 4 years old. The higher the hip score, the less likely the dog is to develop hip dysplasia.
For German Shepherds, the hip score is evaluated on a scale of 0 to 100, with 100 being the best possible score. A score of 25 or below is considered to be normal and would be an OFA "good" or better. A score between 26 and 50 is considered to be borderline, and a score above 50 is considered to be dysplastic.
When choosing a German Shepherd, it is important to consider the hip scores of the parents and even grandparents to ensure that you are getting a puppy that is less likely to develop hip dysplasia. It is also important to have the puppy evaluated by a veterinarian who can assess the puppy's gait, range of motion, and other factors to determine if there are any signs of hip dysplasia.