The "stop" is a depression or step down in
the topline of the head, situated almost centrally between the eyes, at the junction of
the frontal bones of the skull with those of the upper jaw and nose in front.
The "slight but distinct" stop is a small, but critical aspect of a
correct Scottish Terrier head. Breeders selecting for excessive length of head to
the exclusion of all else often overlook the stop, resulting in a gradual flattening of
the head. The stop is crucial because it allows the eyes to be set deeply under the brow,
where they can be protected in a fight. British author Dorothy Caspersz correctly asserts
that the absence of a stop results in a "foreign" expression. The inner corner
of the eye should mark the location of the stop and the longitudinal center of the head
from nose to occiput.

Careful trimming of eyebrows can sometimes give the impression of a
stop when there is none. If a Scottie has a correct stop, you will see a slight but
distinct drop from the level of the topline of the skull to the top line of the muzzle
when the dog is viewed in profile.
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