The experiment that began in Siberia, 1959, has bred foxes that are so far removed from wild foxes, and are so tame that they can become household pets. Kinda pricey ($9K) but very cute.
http://www.domesticfox.com/
We watched a documentary on this years ago. They bred wild foxes, and chose only the most gentle ones from each litter to breed further. After just a few generations, the gene that causes gentleness also causes color variations. This experiment still continues here.
Edit: link is broken
Related video: https://www.youtube.com/watch?v=0jFGNQScRNY
http://blogs.scientificamerican.com/...domestication/
http://www.americanscientist.org/iss...x-experiment/1
http://hyperwires.wordpress.com/2013...d-for-mankind/