Aussies are defined in structure, appearance and temperament by two formal registries, the Australian Shepherd Club of America (A.S.C.A.) and the American Kennel Club (A.K.C.). The standards between the two clubs are similar, however not identical.  What I have written here is a general description of the standards and not meant to be a complete or formal description. 

 For specific standards of each registry, click here:  

ASCA Home Page & Breed Standard Australian Shepherd - AKC Breed Standard

Australian Shepherds are of medium build, quick, agile, high energy dogs.  They are versatile and well suited to hard work and dog sports.  They are moderate in size, with a smooth gait, a strong, dry, well proportioned head with a flat or slightly rounded top skull.  The muzzle tapers to a slightly rounded tip.  Aussies' ears are small to medium in size, set high at the side of the head and fold over to form a triangle.  An Aussie's eyes are very expressive and attentive and may be brown, blue, amber, green or any combination of these.  The eye color may include flecks or marbling. The neck is strong, muscular and slightly arched, the top line is flat, legs are straight and powerful, feet are oval shaped. The overall appearance of an Aussie should give the feel of a square that is slightly longer than tall.

Their coat is medium in length and texture with an undercoat and may be straight to slightly wavy, with feathering on the legs and underbelly.  Breeches (or "feathering" on the hind legs) are moderately full giving the appearance of pantaloons.

Four colors are recognized: Black , Red (liver), Red Merle and Blue Merle with or without white and copper trim.

Height may vary from 20" to 23" inches for males and "18" to 21" for females. Average weight for males is 50 - 65 lbs and 35 - 50 lbs for females. These are preferred size and average weights only. Quality should not be sacrificed in favor of size.

Australian Shepherds are primarily a herding dog of great strength, character and stamina. They are highly intelligent and energetic, versatile and easily trained without harsh corrections. The herding instinct brings a willingness to "work" for their family and a drive to learn and to please.

Aussies tend to be reserved with strangers and possess a strong guardian instinct.   Because of these traits, Aussies make wonderful, loyal companions and hard working partners but must have proper training and care to avoid behavioral problems and/or conflicts with the owners surroundings and lifestyle.

Aussies are not for everyone!  Their energy, intelligence and need to be with and protect their "family"  can quickly become a problem if they are not properly trained, exercised and socialized regularly.  Obedience training and/or a "sport" is highly recommended.  Training methods should be based on positive motivation and not harsh or "hard-handed" techniques. Aussies learn quickly and have a tremendous desire to please and do not require "punishment" type training methods.

Aussies typically excel in obedience, flyball and agility.  These venues help build confidence, provide training and control and afford an outlet for the Aussie's high energy.