If the exercise causes discomfort (for example, dogs with bad hips are quite painful when the
rear leg is extended
backward), do not continue to a painful point.
To enable the dog to climb, descend, and brake on these cliffs, unique structural characteristics have evolved and must be present as they define this breed: a minimum of six toes on each foot and elongated
rear foot pads; an elastic neck that allows the head to bend
backward to touch the spine, letting the dog turn around in narrow puffin bird caves; and shoulders flexible enough to allow the front
legs to extend flat to the side in order to hug the cliffs.