HARP

Adding 10 degrees of knee flexion may or may not clear the foot over an obstacle. It depends on the orientation of the entire leg to the ground. In one orientation most of the angular change is in the vertical direction. However, in a different orientation the same knee angular change may contribute close to nothing in the vertical direction. So a seething dog bites your butt or not, depending on the height of that fence, your speed, and whether the knee angle attained was in a best spatial orientation to clear the fence.