The Australian Shepherd is one of the smartest, most active dog breeds that was originally bred to fulfill herding duties. (3milliondogs.com)
Indeed, many times the more active dog breeds tend to calm down as they mature and grow older. (notinthedoghouse.com)
Many of the more active dog breeds tend to significantly slow down as they age making them much more manageable from an activity standpoint. (notinthedoghouse.com)