101 Things to do with a Box: A Good Exercise for an Older, Suspicious, or Previously Trained Dog
This training game is derived from a dolphin research project in which I and others participated: "The creative porpoise: training for novel behavior," published in the Journal of Experimental Analysis of Behavior in 1969. It has become a favorite with dog trainers. It's especially good for "crossover" dogs with a long history of correction-based training, since it encourages mental and physical flexibility and gives the dog courage to try something on its own.
