Our measurements represent the minimum - maximum circumference of the adjustable neck (A) and the adjustable chest (B). The harnesses can be adjusted at both of these measurement points to suit your pup. To ensure a comfortable fit, we recommend you allow for an additional 2 finger width at both measurement points.
If you find your pup is between two sizes, we would suggest opting for the larger size to ensure the most appropriate fit and to allow for growth.
Any questions, don't hesitate to get in touch!