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the relationship that people have with their dogs. This shift away from neuropsychological research also marked a shift in his publishing strategy, away from single study publications in research journals, to publication of his new data as part of material presented in popular book form. Many of his books on dogs do contain previously unpublished empirical data. For example, his book The Intelligence of Dogs is based on a survey sent to all of the dog obedience judges in the United States and Canada, and resulted in the ranking of 110 dog

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