The Australian Shepherd, often known simply as the 'Aussie', is a medium-sized breed of dog that was, despite its name, developed on ranches in the United States during the 19th century. They are considered the 17th-most popular dog breed in the United States. The Australian Shepherd is traditionally a medium-sized breed. They can weigh from 35 to 70 pounds (16 to 32 kg) and stand from 18 to 23 inches (46 to 58 cm) in height. The Australian Shepherd is traditionally a medium-sized breed. They can weigh from 35 to 70 pounds (16 to 32 kg) and stand from 18 to 23 inches (46 to 58 cm) in height. The Australian Shepherd Club of America (ASCA) standard calls for the Australian shepherd to stand between 18 and 23 inches (46 and 58 cm) at the withers, females being 18 to 22 inches (46 to 56 cm) and males measuring 19 to 23 inches (48 to 58 cm); however, quality is not to be sacrificed in favor of size.