The Australian Shepherd , is a medium size breed of dog that was developed on ranches in the western United States . Despite its name, the breed was not developed in Australia , but rather in the United States where they were seen in the West as early as the 1800s. The Australian Shepherd’s history is vague, as is the reason for its misleading name . It is believed by some that the breed has Basque origins in Spain and was used there by shepherds. However, scientific evidence has shown that the breed has lineage from American dogs that originally came over the Bering Land Bridge . What is known is that it developed in western North America in the 19th and early 20th centuries.
The breed is typically highly energetic, requiring a great deal of exercise and attention, although some can be calm and easy-going. An Australian shepherd enjoys working, whether it is learning and practicing tricks, competing in dog agility, or engaging in any other physically and mentally involving activity. The Aussie is intelligent, learns quickly, and loves to play.  This means that a bored, neglected, unexercised Aussie may invent its own games, activities, and jobs, which to a busy owner might appear to be hyperactivity. Without something to amuse them, Aussies can become destructive. They also have a tendency to form intense, devoted bonds with select people.
High. These dogs require a minimum of 2–3 hours a day of play, exercise, and attention. They thrive in rural, ranch like conditions, and need space to run and play in an urban setting.
Height: 51–58 cm (M) and 46–53 cm (F) / Weight: 23–29 kg (M) and 14–20 kg (F)
straight and may have curls.
Tri-colored (black/red), bi-colored (black/red), blue merle/red merle.
(Source: Wikipédia & The Ultimate Dogs, Dog Breeds & Dog Care by Dr Peter Larkin & Mike Stockman, August 2015)