I used to think that people should use whatever their dog is wild about as a reinforcer in training. I'm not so sure about that now.  It's easy to think that because it's motivating, it's the best reward ever. Sometimes, it can be TOO stimulating!  It can even be distracting.  And if that distraction takes away from learning, are we really doing the best thing for our dog?  There is such a thing as too much of a good thing.