 In the US, most clubs are affiliated with the American Working Dog Federation (AWDF), United States Boxer Association (USBA), American Working Malinois Association (AWMA), United Schutzhund Clubs of America (USA), Deutscher Verband der Gebrauchshundsportvereine (DVG), or German Shepherd Dog Club of America-Working Dog Association (GSDCA-WDA).Schutzhund clubs tend to be small, 20 or fewer members, because there is a limit to the number of dogs that can be trained in one session.Clubs often provide only limited formal assistance with tracking and obedience.