I just want to lay out a few links here. Some of these I found at the rather cool blog, Dog Brother (S. M. Stirling fans take note).

http://dogbrother.blogspot.com/

http://www.guardian.co.uk/life/feature/story/0,13026,1108853,00.html

http://www.sciencedaily.com/releases/2004/01/040123001629.htm

http://www.sciencedaily.com/releases/2004/01/040119082910.htm

And this old one

http://www.gsfc.nasa.gov/news-release/releases/2003/h03-128.htm

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Disclosure. The guy who writes DogBrother is my bro, Kelly Parks, who also writes the Science Moments at my website, feoamante.com