I think you will like this lens more and more as time goes on, as do I. The push pull design seems to me to keep the subject in field better as you zoom........short of a prime what possibly could be better............
you have to see my dog now sorry- grab shot not as sharp as yours, from our walk tonight, 0 degrees here today



great focus on her butt fur though! Her name is Jazzy Blue Eyes........ i showed your Aussie shots to my wife, it really weakend my case for holding off on another puppy so thanks alot!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!11