Layback
Layback is the word used to describe the placement of the
shoulder blade or scapula. It is normally described by the angle formed by a vertical line
drawn through the point of shoulder and a second line drawn from the point of shoulder up
the ridge of the scapula to the tip of the scapula.
Correct layback for a Scottish Terrier is an angle of about 45
degrees back from the vertical. Radiographs have shown that the actual angle is less than
45 degrees but it looks like 45 degrees externally. |
Angulation
Angulation is the word used to describe the angle formed by the
shoulder blade (scapula) and the upper arm (humerus).
In the ideal Scottish Terrier, that angle should approximate a right
angle.
|
Ratio of bone
length
Although the upper arm is slightly shorter than the scapula, it appears nearly equal in
length when examining the dog. This illusion is caused by the fact that the point of the
elbow is included in the visual measurement of the length of the upper arm.
A long upper arm is required so that the front leg is set down well behind the dog's
forechest. (See illustration of Chest.)
If the upper arm is too short, the front legs will be too far forward. (Fox Terrier
front) |