my male is 21" at the shoulders and weighs in around 48#,,he's built like a brick, alot of muscle , no fat, has the shorter working line coat as he's out of los rocosa lines.
My female who is also 21" at the shoulders weighs in around 43#. She has more show coat.
Aussies can run the gamant in size, color, I've seen standard aussies top out at 15-16" and some go as high as 26"..with that weight varies as well
diane