The Australian Shepherd took shape on ranches in the American West in the 1800s, probably from Spanish and Basque herding dogs crossed with collie types that arrived with sheep shipped from Australia. Medium-sized at roughly 40 to 65 pounds, Aussies have a weather-resistant double coat in merle, black or red, often with white and copper trim and blue or mixed-color eyes.
Many Aussies are intelligent, devoted and tireless, happiest with a job to do. They bond tightly with family and can be reserved with strangers. Without daily exercise and mental work, that drive can turn into herding children, chewing or barking. That makes them a better match for active adopters who enjoy training and don't mind a moderate to heavy seasonal shed.