WASHINGTON, July 28, 2014 — Here at Reactions, we ask the tough questions to get to the bottom of the biggest scientific quandaries. In that spirit, this week's video explains why dogs sniff each other's butts. It's a somewhat silly question with a surprisingly complex answer. This behavior is just one of many interesting forms of chemical communication in the animal kingdom. Find out more at http://www.youtube.com/watch?v=PZlJ8XfwiNg.
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