The ratio of border length to shoulder height is 10 to 9. The shoulder height is the distance from the scapula to the ground. The angle between the scapula and the upper arm bone is 90 degrees, and the length ratio is 1 to 1. The upper arm bone is in front of the scapula. The angle between the broken piece and the bone; the upper leg bone and the lower leg bone is 110 degrees, which is also a relatively perfect angle, and the upper leg bone and lower leg bone are also the same length when ideally.
Their physical characteristics allow them to move quickly in a crouching posture when grazing, just like cats hunting. This feature arises from the gaps between the tops of the Border Collie's shoulder blades, like the gaps in the sections of a train, allowing the Border to make minute adjustments to herd and chase lone sheep with absolute precision.