Hip dysplasia is the medical term for a hip socket that doesn't fully cover the ball portion of the upper thighbone. This allows the hip joint to become partially or completely dislocated. Most people with hip dysplasia are born with the condition.
Some common symptoms of hip dysplasia include:Pain in the groin or side of the hip,A sensation of “catching” or “popping” with activity, Worsening pain with sitting, walking or running, Limping, Increased difficulty with strenuous activities. The diagnosis of canine hip dysplasia is typically made by combining: clinical signs of arthritis and pain, a complete physical exam, and radiographs (x-rays).
There is no evidence to indicate a mixed breed dog has a lower incidence of hip dysplasia than a purebred dog (see the AKC website for more data). It is a fallacy. If a parent carried the gene a mixed breed dog is as likely to have problems as a purebred dog. Additionally, ethical breeders are very careful to monitor their programs and remove breeding stock found to produce puppies with genetic problems, something that is very unlikely in a mixed breed dog. If you go to the OFA, Orthopedic Foundation for Animalshttp://www.offa.org/index.html you will find the following table (we copied the top 100 breeds, we suggest you go to the site for the full, most up to date list).