Australian Shepherds are medium-sized, muscular, agile, supple, and fast (take note before you find yourself flapping at the end of their leash). They are bred to be active and pushy work dogs with the exceptional capability of herding livestock for miles through snowdrifts and rough terrain. In fact, they have an overwhelming impulse to herd anything from dogs to birds to kids.
Their double coat makes them weather resistant. They are also year-round shedders, especially in spring when they lose their winter coats. Aussies are cautious around strangers, so they need puppy training and young socialization to become well-rounded dogs with good social skills. If they don’t get the mental and physical stimulation they require, they can become frustrated and hard to live with.