Australian Shepherd
A complete guide to the Australian Shepherd, covering its US origins, health risks like MDR1, double merle traits, and exercise needs.
The Australian Shepherd is a medium-sized herding dog from the United States, despite its name suggesting a different origin. The breed was developed in California in the 19th century, likely descending from Spanish sheepdogs and collies imported from Australia and New Zealand.
History and origins
The breed's lineage traces back to pastoral dogs brought to North America in the 1500s to herd Spanish flocks, with speculation that the Carea Leonés was among the ancestors. While the name implies an Australian origin, the dogs actually took their name from the trade route involving sheep and herding dogs imported from Australia and New Zealand. For over a century, the breed remained a purely working dog valued by ranchers for its ability to handle sheep and cattle across the Western United States.
The breed's transition from a working animal to a popular companion began in the mid-20th century when rodeo performer Jay Sisler showcased the dogs' trick-performing abilities at rodeos. This exposure led to the formation of the Australian Shepherd Club of America and eventual recognition by major kennel clubs, starting with the United Kennel Club in 1979 and the American Kennel Club in the 1990s. By 2024, the breed had climbed to the 12th most popular dog in the United States.
Physical characteristics and size
Australian Shepherds are athletic, medium-sized dogs with a height range of 18 to 23 inches (46 to 58 cm) and a weight between 35 and 70 pounds (16 and 32 kg). The breed standard specifies that males should stand 20 to 23 inches tall, while females range from 18 to 21 inches, though individual dogs may slightly exceed these limits. They possess a moderately long, wavy double coat with a dense undercoat and a coarse topcoat, featuring feathering on the rear legs and shorter hair on the face.
The breed is renowned for its unique color variations, including blue merle, red merle, solid black, and solid red, often with white markings or tan points. No two dogs share the exact same coat pattern. Tail appearance varies naturally, with some dogs born with long tails and others with naturally bobbed tails. While docking was traditionally common for long-tailed dogs, many countries outside the United States now prohibit the practice, allowing long and partial bob tails in shows.
Temperament and behavior
These dogs are defined by high intelligence, loyalty, and an intense drive to work. Even when kept as companion animals, they retain a strong herding instinct that often manifests as attempts to herd children or other pets. Their active nature means they require significant physical and mental stimulation; without adequate exercise, they are prone to becoming destructive.
Training is generally straightforward due to their biddability, and they excel in a wide range of dog sports including agility, obedience, rally, and tracking. Their unique stride involves the front and back legs crossing over, creating an appearance of speed that is "on the edge." They also possess strong hips and legs, allowing for high jumps of up to 4 feet (1.3 m) and an instinctive "pounce" position used to manage cattle that try to kick.
Health and genetic concerns
A 2024 UK study established a median life expectancy of 13.7 years for the breed, which is higher than the median for purebreds (12.7 years) and crossbreeds (12 years). Despite their longevity, owners frequently report eye problems such as red eye, epiphora, conjunctivitis, and cataracts, alongside dermatological and respiratory issues. The breed is also notably susceptible to hereditary cataracts.
A critical genetic concern is the MDR1 gene mutation, an autosomal recessive trait that causes extreme sensitivity to certain drugs, including ivermectin, at doses considered safe for other dogs. A genetic test is available to identify carriers. Additionally, hip dysplasia occurs at relatively low levels in the breed, estimated at approximately 6%. Prospective owners should be aware that the MDR1 mutation is one of the more common genetic issues affecting the breed.
The double merle and "lethal white" myth
Breeding two merle dogs together produces double merles, which often exhibit excessive white areas and can suffer from severe hearing and vision impairments. These dogs may be born deaf or blind, or develop conditions such as iris colobomas, retinal detachment, and microphthalmia. The lack of melanocytes in the ear canal, which provide necessary potassium levels for the cochlea's hair cells, directly links the white coat color to auditory impairment.
The term "lethal white" is a misnomer derived from equine syndromes; the genetic trait itself is not fatal, but the condition often leads breeders to cull affected pups immediately after birth. While blue eyes are often associated with eye problems due to visibility, dogs with other eye colors can also suffer from these conditions. There is no surgical or medical treatment to reverse the damage caused by the double merle gene.
Activities and capabilities
Australian Shepherds are versatile athletes capable of mastering stockdog trials, dock diving, disc, and flyball. Their herding instincts can be evaluated through noncompetitive tests before they enter formal ASCA or AKC events. A notable example of their longevity and capability is Pockets, an Australian Shepherd who earned the Rally Novice title at 15 years and 5 weeks, the oldest dog to achieve an AKC title in history.