The proportion and curvature of the outline of a horse's neck, back, and croup; a line from poll to tail-head.

Line formed by the withers, back, loin, and croup.

Term used to describe the shape of the horse from wither to croup. A nicely rounded slightly convex topline should be aimed at.

The dog's outline from just behind the withers to the tail set.

A common term used to refer to a llama's back, usually as viewed from the side. A level topline is desired from the whithers to the tail.

the horizontal made by the top of the withers through the bottom of the croup