This is rather controversial for some breeds such as the Caucasian Ovcharka and other livestock guardian breeds because of their protective nature. (ilrdb.com)
Many owners of livestock guardian breeds believe that breeds like the Great Pyrenees or the Kuvasz are not easily trained because their stubborn nature prevents them from seeing the point of such commands as «sit» or «down». (sheppardsoftware.com)
SOME dog breeds have ZERO pack behavior (livestock guardian breeds for example). (btoellner.typepad.com)