Oldest recently got a female mini Australian Shepherd.
Dog is smart, mellow, and affectionate. Wonderful.
Unlike her male full size Australian Shepherd. That guy is a million miles an hr all the time. Yeeesh.
Yup...the Mini Aussie. Our female goes 35 lbs, about 17/18" tall. Easily the smartest dog I've ever had. Works hard when it's time, but mellows out when it's time for that too.