As is stated in the official 'country of origin' breed standards for both the Australian Cattle Dog and the Australian Stumpy Tail Cattle Dog, a "scissor" bite is the only acceptable positioning of the upper and lower jaws and teeth that results in "the anterior tables of the lower incissors being in even contact with the posterior tables of the upper incissors".
In laymen's terms the above description is probably better expressed as saying; "when the mouth is closed the front of the lower incissors (those 6 teeth located at the front of each jaw between the two big 'canines')of the Mandible (lower jaw)), should be touching the rear of the incissors on the upper, fixed jaw that is part of the skull itself. Any gap between these upper and lower incissors is classed as a fault. Two much gap between the upper and lower teeth with the upper jaw in a protruding situation is referred to as an "overshot" bite or overbite. The reverse situation, where the lower jaw and teeth protude in front of the upper with a discerning gap is known as an "undershot" bite or underbite.
A 'level' or 'even' bite, where the incissors sit level with each other on both jaws is also unacceptable.
As a point of interest, the ACD and the ASTCD should have full dentition. No missing teeth. We all know that dogs can lose teeth by various means and I can not accept judges that will refuse to place a perfectly conformed exhibit because it had one premolar missing. JMHO.
The breeds should have 42 teeth in total. 12 incissors (6 on top jaw and 6 on the bottom jaw; 4 canines (the 2 bottom cannines should be seen to fit bewteen the 2 top canines when the mouth is closed);16 premolars situated between the cannines and the back teeth or molars; 4 molars on the upper jaw and 6 on the lower jaw.
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