I don't have a dog of my own <img src="/ubbthreads/images/graemlins/frown.gif" alt="" />,but I would go with the aussie cattle dog.My sister lives in Montana,and had a boy friend with a ACD.It was amazing to watch him work cattle.Very smart breed. <img src="/ubbthreads/images/graemlins/thumbup.gif" alt="" /> <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />