The docking slot at the back adds a
slight bulge to the design raising the centre profile
from 9 mm to 16 mm but that has no impact on usability.
Generally a dog in good weight when looking above the dog down his back,
from shoulders to rump the dog will be a straight line,
slight indentation at the withers (waist) okay but should not be defined and neither should he
bulge out at the withers.