"Train fast dogs slow, and slow dogs fast." Actually, I think it refers to "handle fast dogs slow and slow dogs fast" and doesn't refer to rushing dogs through a training program.
That said... I am learning to be quicker on a whistle, but slower doing everything else because I tend to get in a run-and-gun tempo when I'm trying soooo hard to do things right. (And of course the dog loves this and she gets faster and I get faster and the whole exercise goes pffffttt... down the drain!) So, the first part of the proverb I get.
But how do you train a slow dog fast?