I like betting on the younger dogs, (the early racers) because they're either scared, hyper, or doing a poo when they're walked to the start. Ignore the scared ones doing a poo, and bet on the crazy looking ones. I had a few lucky wins with this method, but I cannot guarantee success! Don't bother with the older dogs (i.e. the latter races), they all look the same, and generally have had a poo before the race. Good luck!