Here are some breeders in the United States, visit their sites and find out as much information, as you can about their programs.
Contact them, and ask them your questions.

Von Haus Parker (Alabama)
Robinwood Farms (Arkansa)

Schloss Felsen Kennels (Nebraska)
Select Shepherds (New Hampshire)
von Hena-C (New Hampshire)
Alpha K9 Academy (New Jersey)
Karizma Kennels (New Jersey)
Jagermeister German Shepherds (New Jersey)
Cypress German Shepherds (New York)
Jackson and Vom Wasserbarhund Kennels (New York)
Vom Kammer Shepherds (New York)
Jagerstadt Kennels (North Carolina)
K-9 Bodyguard (North Carolina)
Walltop Kennels Inc. (North Carolina)
vom Eichen Hugel German Shepherds (North Carolina)
Haus Brezel German Shepherds (North Carolina)

vonder Hollenburg German Shepherds (Ohio)
Ravine's German Shepherds Ltd. (Ohio)
Vom Himmelhoch Shepherds (Ohio)
Whited K-9 Services, Inc. (Ohio)
Van Den Heuvel K9 (Oregon)
Professional Dog Training (Oregon)

Adler Stein Kennels (California)
German Shepherd Kennel "vom Grunenfeld" (California)
True Haus Kennels (California)
Fleischerheim German Shepherds (California)
von Salerno Kennels (California)

Vom Landholz GSD'S (Florida)

Greenwood Shepherds (Georgia)

Draggahaus German Shepherd (Texas)
Allendale German Shepherds (Texas)

Royalair German Shepherds (Iowa)
Holtgrew's German Shepherds (Iowa)

Von Waldberg German Shepherds (Washington)
Hidden Haus Kennels (Washington)
NorthWest K9 (Washington)
Kraftwerk K9 Kamp (Washington)
Samish River Kennels (Washington)
Von Stevenhaus Shepherds (Washington)
Leerburg Kennels (Wisconsin)
Steffen-Haus Kennels (Wisconsin)

Abraxas Shepherds (Kansas)

German Shepherds of Münster Abbey (Maine)
von der Polizei German Shepherds (Maryland)
Canine Protection International (Massachusetts)
Kolenda Kennels (Michigan)
Fruend German Shepherds (Michigan)
Happy Ray Manor (Missouri)
Eve-Mar German Shepherd Dogs (Missouri)
Omega Shepherds (Montana)