Angulation and Movement
The German Shepherd Dog is a trotter. His gait exhibits diagonal movement, i.e., the hind foot and the forefoot on opposite sides move simultaneously. The limbs, therefore, must be so similarly proportioned to one another, i.e. angulated, that the action of the rear as it carries through to the middle of the body and is matched by an equally far-reaching forehand causes no essential change in the topline.
Every tendency toward over-angulation of the rear quarters diminishes soundness and endurance. The correct proportions of height to length and corresponding length of the leg bones results in a ground-eating gait that is low to the ground and imparts an impression of effortless progression. With his head thrust forward and a slightly raised tail, a balanced and even trotter will have a topline that falls in moderate curves from the tip of the ears over the neck and level back through the tip of the tail.