This was the first time I was able to pan fast enough to catch Ty in full sprint across the yard. I wish it was a little clearer, but man, he's fast! Taken at ISO 200, 185MM F/6.3 at 1/320. Any advice for improvements is appreciated.
Bump your ISO up to 640 or 800 to get higher shutter speeds. A sharp image with a little noise is better than a blurred image. Panning does not eliminate the up and down motion of a dog in full tilt run mode. Also, notice your fence in the background is not blurred by the pan, it's just OOF. BTW, I love boxers, Ty is a very good and healthy looking specimen!
Ok, I will up the ISO. To make a motion blur on the background do i slow the shutter speed more? It's so hard to catch him anyway...
No to blur the background I would use a larger aperture. I only mentioned the fence to not your shutter speed was fast enough to freeze your panning, but not fast enough to freeze the dogs up & down motion while running.