Dimensions and sizing
The breed types listed are intended only as a rough guide as there are so many variations in sizes across the breeds.
Measurements for the neck are taken around the base of the neck, below the collar.
The body piece measurements (chest) are taken around the rib cage behind the elbow allowing room for the elbow and shoulder to move.
Back piece is measured from O ring on the withers to the end of the webbing by the double D rings.
Dogs with a large shoulder are best suited to the extended back piece (x-back piece) in either the medium or large harness depending on their size.