The name is thought to have come from the fact that someone tasked with one of these 'half' watches was said to be 'dodging the watch', taking or standing the 'dodge watch'. This became shortened to 'dog watch'.
An alternative etymology is that those sleeping get only 'dog sleep' in this watch.
The reason behind this watch's existence is that in order for the crew to rotate through all the watches it was necessary to split one of the watches in half. This allowed the sailors to stand different watches instead of one team being forced to stand the mid-watch every night.
The choice of time also allows both watches, if there are only two, to eat an evening meal at about the traditional time.
See also
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Last updated on Friday August 01, 2008 at 22:46:02 PDT (GMT -0700)
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