I shot a lot of pics trying to capture this wired pup in full tilt run. This puppy goes like a bat out of hades.
I was using my 200-500 (because initially I went to shoot birds but that turned into a dog run ... don't ask).
Next time I think I'll try my 70-200, open up the aperture a bit (4 or 5.6, maybe even 8) to give me more DOF to increase the odds of the dog being in focus. I also need to learn to pan ahead of the dog. Most (as in maybe two thirds) were of the dogs hind end, missed the head, Lots of fun trying to follow a tiny pup running full tilt.