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1) The domestic cat and domestic dog both date to the same moment in human history, Syria about 17,000 years ago. How essential were these animals to the development of agriculture and cities? Why? How did humans sleep in the days before domesticated dogs? - Ira Socol, Michigan State University

Before dogs were domesticated we had to take shifts during the night around campsites to make sure that no one would attack during the night. But after dogs were domesticated they were used to stand guard, not only could the dogs hear the intruder coming before the intruder could even see the campsite.