You have to use the principles behind Pavlov's conditioning experiments in order to play this game and get the dog to drool when he hears a sound. You can also get more information about Ivan Pavlov and his research.

Peggy Andover explains how the brain can associate unrelated stimuli and responses, proved by Ivan Pavlov's famous 1890 experiments, and how reinforcement and punishment can result in changed behavior. [4:13]