Thank you for the tips... Will focusing on that much shutter effect the detail of the overall shot?
Keeping your shutter speed at or above 1/500 will freeze all but the fastest of fast-action. It's certainly plenty of shutter-speed to eliminate all the motion blur of a running dog. And keeping the ISO at 100 or 200 ensures you won't have noise in your photo's so your shots should be good and "crisp" assuming strong, direct sunlight.
The only things you MAY want to consider is that using a fast shutter speed at low ISO is going to mean your depth of field is not exactly going to be waaay deep, so good focus technique for these shots will be important. Like a sniper: Aim for the head!
Second, and this purely an aesthetic thing... A little motion blur can really add a nice dynamic to a shot, communicating a sense of motion and excitement. I wouldn't be afraid to drop my shutter speed down to maybe 1/125 (and then chimp the shot) just to see how it looks; adjust as necessary. Freezing motion is good, but don't be afraid to experiment and mix things up a little to break up the sameness of the shots.