As someone already mentioned a Heeler can save your life. Mine did twice and now that she is retired she still gets treated like the good friend she has always been. Over the years our Heeler has been worth at least 4 or 5 hired men, works for dog food, has a personality that makes you smile and bites annoying salemen when I tell her to...j/k...but she would if I asked.
I would not own cattle without a Heeler or some version thereof.
Regards,
Dave.