Despite the name, the Australian Shepherd took shape on ranches in the American West in the 1800s, likely from Spanish and Basque herding dogs crossed with collie types that arrived with sheep shipped from Australia. Aussies are medium-sized, usually 40 to 65 pounds, with a weather-resistant double coat in merle, black or red, often with white and copper trim and blue or mixed eyes.
Many Aussies are intelligent, loyal and tireless, and they tend to bond tightly with family and stay reserved with strangers. Herding drive can show up as heel-nipping, circling or chasing, and moderate to heavy shedding means regular brushing. They suit adopters who enjoy training and daily activity, though every dog varies in energy and temperament.