Masaya, Benchmark, Landgraf, Apexe and more come to mind for serious working dogs. They usually give priority to working homes although I've seen their dogs in other active sports.

Ground Zero Schutzhund Club is in Southern California, Christian Gomez is an outstanding trainer/decoy and works with all breeds. Some of his club members went to the USCA regional championship in AZ earlier this year and placed 1st & 2nd with a Doberman placing 2nd (USCA is all breed trial but GSDs dominate). If you are anywhere near this club I would contact them for at least a visit and express your interest in working Dobermans. Asha and I had the pleasure of a 2-day workshop with him years ago.My challenge (and I've heard similar from a couple of GSD buyers) is there is not much going on out West.

