In recent news, a German shepherd was guarding the body of her master who apparently committed suicide 6 weeks earlier. She had been living off mice and other small animals, while protecting the boy of her master from coyotes. You wont find a cat doing something like that for there master! Here is a link to one of many articles about it on the web:

http://www.greeleytribune.com/article/20080812/NEWS/863952458/1002&parentprofile=1001