Two posts sunk in concrete with guidewires of some form. String a cable between the post, buy a pulley, hook chain with swivel to pulley, other end to the dog.
I will post pictures later tonight, IM at work now and this computer will not let me into photobucket
"Life is like a grindstone. Whether it grinds you down or polishes you up depends on what you are made of."
But a Constitution of Government once changed from Freedom, can never be restored. Liberty, once lost, is lost forever. John Adams