More than half of dogs trained to assist people with disabilities do not complete the training.[1] Scientific approaches such as cognitive test batteries predict the success of puppies and their suitability for specific tasks.[1] Estimated Breeding Values (EBVs), used in livestock breeding, help optimize working dogs before birth.[1] In the Guiding Eyes program, the use of EBV reduced the incidence of hip and elbow dysplasia to almost zero in about 10 years, and other problems such as epilepsy and harness sensitivity.[1] Now, about half of Guiding Eyes puppies go on to become successful guide dogs.[1] Genomically enhanced EBVs (GEBVs) use genome-wide DNA markers to more accurately estimate disease and behavioral risks.[1] Cognitive tests on 164 assistance and 222 detection dogs predicted the success of the top 25% of graduates with 86% accuracy.[5] These methods reduce training costs and improve the availability of better working dogs for humans.[1][5]