There are different breeds of LGD are used in USA, in other places in the world everyone has their own breed but in the U.S. and Australia, which does not have its own breed of LGD and have the same problems, I'd like to know if the breeds most used are used on the basis of data found in the work area, or is only for a follow a trend of the breed! I found a table, on page 3 of the link, that summarizes the various characteristics of guardian dog breeds. If you have some data would be interesting to compare them. http://www.agriculture.gov.sk.ca/Default.aspx?DN=5f3648e8-ceed-48ab-adc7-66a2031e0636