murray ruggiero, rip, his I-system that was popular in the early 2000 utlized correlation like this for different markets as to find when they are in correlation or inverse correlation for trading different approaches. I don't remember more, but if you research him and I master you should get...
personally a big fan of Boston Terriers, similar size and great temperament, personality and companion dog. They love to play, but are also great at just hanging around.