Thanks for all the wonderful comments. What a way to wake up to reading these. 
The trick to these shots was centre point focus, one shot mode, picked the focus point of a railing/jump etc, and clicked as the dog was in line with it. Never went wrong. It was only when I was on AI Servo mode, it kept missing focus, so I changed it.
Still a great lens.
Tim: Yeah, this time I used the new monopod.
For mills, and also another for the Boxer fans. 
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