FRONT LEGS:
     Straight with ample bone and proportion placed well under the body. Feet pointed forward and at the same distance apart from between the elbows and at the feet. Forearm and upper arm are of approx. equal distance, forearm being slightly longer
Fault: turned in or out, bow legged.

ELBOW:
     Free from the body, held close and perpendicular. When viewed from the front, elbows should not be visible.Fault: turning neither in or out, bow legged. 

FRONT FEET:
     Oval, compact, well arched, middle two toes longer than the others. Well up on pastern showing   a very slight angle towards the ground. Front and rear dewclaws are normally removed. This cuts down injuries to the working dogs feet. If front dewclaws are present they are not to be faulted.
Fault: feet turned either in or out, splayed. Down on
pastern or knuckled over. Rear dewclaws.

 
This dog shows proper leg
proportion. Legs are
straight with equal distance.
.
This dog has a narrow chest which
lacks any depth causing his elbows
and feet to turn out,it lacks in sufficient 
neck and body muscle giving his head insufficient support


BODY


The body length of both classes is the same, it is the length of leg that differs.
.
CLASS A - Height is approximately the same to length, measured from ground to withers and from point of shoulder to rump, length not to exceed 1 1/2" from height. For example if your dog is 12 " long, it should measure no less than 10 1/2" in height.
Fault: excessive barrel chest or round body.
.
CLASS B - the shorter leg type, body length not to exceed  3 " or less than 1 3/4" from height. For example if your dog measures 12" in length, its height should fall between 9"- 10 1/4". Fault: excessive barrel chest or round body.
.
BACK: (Topline)
     Level, straight and strong. Tail set high coming right off the back. 
.
BRISKET: (chest rib cage)
     Set fairly deep giving ample lung space, lying even or just above the elbow. Ribs are well sprung but do not interfere with leg placement. 
Fault: to shallow or too wide causing bowing or turning in or out of legs. 

TUCK UP:
     The bottom line has moderate tuck up into the loins (waist).  Fault: Extreme tuck up as seen in the Greyhound breed causing the backto roach or lack of tuck up giving a straight underline appearance.

Photo shows top line, tail set, tuck up
and depth of brisket on the Rat Terrier
 

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