Hip dysplasia is mainly a problem in medium to large breed dogs. The dog breeds most commonly affected are the German Shepherd, Labrador Retriever, St. Bernard and Golden Retriever. It is also becoming more prevalent in certain breeds such as the Rottweiler and the Border Collie. Certain kennel clubs and federations have taken great steps with breeding programmes to reduce the incidence of hip dysplasia in puppies that are registered and tested for the problem. The main problem lies in backyard breeders and people that have a litter at home with their dogs as they may not be aware of, or test for hip dysplasia.