You gone yet Tiff? I imagine you have but my tip is get a form book thing they give out and look at what level the dog has run at previously. I.e. it might have won it's last 6 races but if that was at S2 grade and it's now running A4 or whatever, it probably won't take the win this time as it's used to running against a lesser grade of dog.

Also take into account the length of its previous races and the length of the one it's about to run.

Good luck fella!