sorry - I sort of went off on a tangent there!!! As far as economical movement, I think the smaller working GSDs are more agile and can still trot pretty well, if not as breatakenly "pretty" - I know I was driving a quad around the Kentucky Horse park and watching my working line trot at a solid 25 MPH for at least a half mile!!! Yet she was a whiz at twists, turns, jumps etc in agility. The bigger the animal, generally the less agile and athletic.
Csabre Sch1, Hexe Sch2, SG Bengal, Lynx, Komet, Kira HGH & Kougar v Wolfstraum ~ Ziberia IPO1 ~ ATB Basha, Kougar & Kyra, Fenja, Sch3s, Cito, Sch2, Danger RH & Alice Sch1s ~Kelsey