Page 44 - JRT Magazine - 2023 Issue 2

Education

Postulate #2 describes the orientation of the Lastly, postulate #7 states that the length of the
scapula and pelvis, having similar angles so that an body (sternum to point of the hip) shall equal the
intersecting line creates a 90-degree angle (See distance between the front leg and the hind leg
earlier Fig 2). Postulate #3 says that a vertical line when the rear pastern is vertical (Fig 10).
drawn down from the intersection of the lines in
postulate 2 will be the dog’s center of gravity (Fig 8). Distance between point of shoulder and
point of hip equals the distance between
A vertical line drawn down from the the feet when the hock and pastern are
intersection of the lines for the shoulder and perpendicular to the ground
hip represents the center of gravity Yerusalimsky's Postulate #7
Yerusalimsky's Postulate #3
Fig 10

Fig 8

Yerusalimsky’s suggested biomechanical model
of a balanced dog does indeed fit the breed
standard described for the Russell Terrier--a
Postulate #4 states that the shoulder and hip balanced silhouette with no one part exaggerated
should be at the same level on a horizontal line over another. We can use postulate #1 to further
and that the elbow and stifle joints should be level theorize the Russell’s ideal proportions. By
with each other on a second horizontal line (See maintaining a 2:1:1 ratio (or 4:2:2) for the backline,
earlier Fig 5). We will skip postulate #5 since it we can postulate the proportions for the rest of
has to do with movement. Postulate #6 describes the dog by maintaining the symmetry required in
the need for the point of the elbow to sit on a the standard (Fig 11).
vertical line directly below the withers while the
stifle joint lies on a vertical line below the base of
the tail (Fig 9). Estimated proportions of parts of the
Russell Terrier fitting the biomechanical
model of the dog and the breed standard.
The elbow and stifle joints sit on vertical A=Shelf, B=Croup, C=Loin, D=Chest,
lines directly below the withers and the E=Shoulder, F=Forechest
base of the tail, respectively

Fig 11
Fig 9

44 | A Worldwide Magazine for the Jack Russell Terrier / Russell Terrier • Issue 2/2023