A Treatise on Painting/Chapter 71
Chap. LXXI.—Of Quadrupeds and their Motions.
The highest parts of quadrupeds are susceptible of more variation when they walk, than when they are still, in a greater or less degree, in proportion to their size. This proceeds from the oblique position of their legs when they touch the ground, which raise the animal when they become straight and perpendicular upon the ground.