on the Monday following the time change Dog behavior and the human–canine bond Later in his career, Coren shifted to the study of canine behavior and 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 Many of his books on dogs do contain previously unpublished empirical data.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 breeds by intelligence. This ranking caused a rather large media stir. His book Why We Love the Dogs We Do looks at the personality of people and how the owner's personality predicts their relationship with various dog breeds. It is based on a survey of more than 6000 people who took a personality test and reported on their experiences with the various dogs that they have owned. This book proved to be very popular and Coren's personality test is now used by some dog shelters to determine whether prospective owners are suitable for a particular breed of dog. Similarly, his book Why does my dog act that way? uses data from approximately a thousand dogs to determine features of the personality of various dog breeds. However other books that he has written on dog behavior have provided less formal data presentation and in these his creative contribution is based on the organization and interpretation of the research of others, as is the case in How to speak dog. These books have also been well accepted and have been proven to be very popular. Books Coren's first book outside of professional psychology circles was 1993's The Left-Hander Syndrome: the causes and consequences of left-handedness, which presented data on the significant challenges faced by left-handed people in society. His research was discussed widely, and has been printed and discussed in a number of professional journals such as Psychiatric Times. His next book was Sleep Thieves, the result of his studies into sleep and the lack of it. The book examined how the reduction of sleeping time in modern society has created problems of sleep deprivation for many people. The 1994 publication of The Intelligence