United Schutzhund Clubs of America (USA) -  

  http://www.germanshepherddog.com/

USA Southeastern Region Website -

 http://www.southeasternregionusa.com/

American Working Dog Federation (AWDF) -

  http://www.awdf.net/

FCI - 

 http://www.fci.be/home.asp?lang=en

Orthopedic Foundation for Animals -  

http://www.offa.org/