As the name implies the dog's prime function, and one in which he has no peer, is the control and movement of cattle in both wide open and confined areas. Always alert, extremely intelligent, watchful, courageous and trustworthy, with an implicit devotion to duty making it an ideal dog.

The Cattle Dog's loyalty and protective instincts make it a self-appointed guardian to the stockman, his herd and his property. While naturally suspicious of strangers, must be amenable to handling, particularly in the show ring. Any feature of temperament or structure foreign to a working dog must be regarded as a serious fault.

The head is strong and must be in balance with other proportions of the dog and in keeping with its general conformation. The broad skull is slightly curved between the ears, flattening to a slight but definite stop. The cheeks muscular, neither coarse nor prominent with the underjaw strong, deep and well developed. The foreface is broad and well filled in under the eyes, tapering gradually to form a medium length, deep, powerful muzzle with the skull and muzzle on parallel planes. The lips are tight and clean. Nose black. Eyes - The eyes should be of oval shape and medium size, neither prominent nor sunken and must express alertness and intelligence. A warning or suspicious glint is characteristic when approached by strangers. Eye color, dark brown. Ears - The ears should be of moderate size, preferably small rather than large, broad at the base, muscular, pricked and moderately pointed neither spoon nor bat eared. The ears are set wide apart on the skull, inclining outwards, sensitive in their use and pricked when alert, the leather should be thick in texture and the inside of the ear fairly well furnished with hair. Mouth - The teeth, sound, strong and evenly spaced, gripping with a scissor-bite, the lower incisors close behind and just touching the upper. As the dog is required to move difficult cattle by heeling or biting, teeth which are sound and strong are very important.

The neck is extremely strong, muscular, and of medium length broadening to blend into the body and free from throatiness.

The shoulders are strong, sloping, muscular and well angulated to the upper arm and should not be too closely set at the point of the withers. The forelegs have strong, round bone, extending to the feet and should be straight and parallel when viewed from the front, but the pasterns should show flexibility with a slight angle to the forearm when viewed from the side. Although the shoulders are muscular and the bone is strong, loaded shoulders and heavy fronts will hamper correct movement and limit working ability.

The length of the body from the point of the breast bone, in a straight line to the buttocks, is greater than the height at the withers, as 10 is to 9. The topline is level, back strong with ribs well sprung and carried well back not barrel ribbed. The chest is deep, muscular and moderately broad with the loins broad, strong and muscular and the flanks deep. The dog is strongly coupled.

The hindquarters are broad, strong and muscular. The croup is rather long and sloping, thighs long, broad and well developed, the stifles well turned and the hocks strong and well let down. When viewed from behind, the hind legs, from the hocks to the feet, are straight and placed parallel, neither close nor too wide apart.

The feet should be round and the toes short, strong, well arched, and held close together. The pads are hard and deep, and the nails must be short and strong.

The set on of tail is moderately low, following the contours of the sloping croup and of length to reach approximately to the hock. At rest it should hang in a very slight curve. During movement or excitement the tail may be raised, but under no circumstances should any part of the tail be carried past a vertical line drawn through the root. The tail should carry a good brush.

The action is true, free, supple and tireless and the movement of the shoulders and forelegs is in unison with the powerful thrust of the hindquarters. The capability of quick and sudden movement is essential. Soundness is of paramount importance and stiltiness, loaded or slack shoulders, straight shoulder placement, weakness at elbows, pasterns or feet, straight stifles, cow or bow hocks, must be regarded as serious faults. When trotting the feet tend to come closer together at ground level as speed increases, but when the dog comes to rest he should stand foursquare

Blue - The color should be blue, blue-mottled or blue speckled with or without other markings. The permissible markings are black, blue or tan markings on the head, evenly distributed for preference. The forelegs tan midway up the legs and extending up the front to breast and throat, with tan on jaws; the hindquarters tan on inside of hindlegs, and inside of thighs, showing down the front of the stifles and broadening out to the outside of the hindlegs from hock to toes. Tan undercoat is permissible on the body providing it does not show through the blue outer coat. Black markings on the body are not desirable. Red Speckle - The color should be of good even red speckle all over, including the undercoat, (neither white nor cream), with or without darker red markings on the head. Even head markings are desirable. Red markings on the body are permissible but not desirable.

Dogs 46 to 51 centimeters (approximately 18 to 20 inches) at withers, bitches 43 to 48 centimeters (approximately 17 to 19 inches) at withers.

Any departure from the foregoing points should be considered a fault, and the seriousness with which the fault should be regarded should be in exact proportion to its degree.