I don't know exactly what goes into a psychiatric service dog, but I'm not sure working line GSDs would be the best for that. Could you explain further, what *traits* and *qualities* you are looking for?
Hunter, USA trial helper, Charleston Working Dog Club Training Helper
Beschützer des Jägers v. Sportwaffen, HOT, IPO1, AD, CGC
Katya v. Hügelblick, HOT, IPO2, CGC
SG Aska v. Ketscher Wald, 2 x SchH3, Kkl 1