In anatomical terms (not literal terms) - a straight, very strong > well developed back muscles create a slight rise, slightly sloping backline > high, long, sloping withers
In both anatomic and literal terms a very highly positioned anticlinal spine > downward lumbar spine bend = curved backline > high but level withers. Kyphosis of the spine
In both anatomic and literal terms a high positioned anticlinal spine > severe downward lumbar spine bend = a peak to the spine and curved backline > high but level withers. Kyphosis of the spine
Note: As the lumbar spine increases in its angle, it inclines the pelvis and the hip and stifle get closer to the ground - another story for another day.