run away dog

Question
we adopted a lovely one year old female weimaraner.  we have had weims in the past and love the breed.  This girls background is a mystery of course.  Our weims never presented a run away issue in the least (we raised them from puppies).  Our new Coco will bolt and not look back.  I've tried increasing the bond to no avail.  We live on four acres and don't want to fence a yard.  We tried an invisible fence with our other dogs so they could be out when we weren't in the yard with them but this could not be trusted.  Are there any other training methods etc... we might try?

Thank you for your time

Answer
Most of what I know about dogs I have learned in a program that forbids letting dogs run loose.  As far as I know, there isn't any good answer to your question.  I will give you what I have.  

"Come" needs to be taught as part of proper pack status and obedience. The dogs see all the people and dogs in the household as a pack with each having their own rank in the pack and a top dog. Life is much easier if the 2 legged pack members outrank the 4 legged ones. You can learn to play the role of top dog by reading some books or going to a good obedience class. Start at http://www.dogsbestfriend.com/

If you dog is at least 4 - 5 months old, start with a good 6' leather leash and a sturdy slip collar, the metal chain ones with the rings on each end. You want the shortest one that will go on and off easily. If you walk with the dog on the left, pull the chain through one loop forming a "P". Facing it, slip it over its head. The free end should come over the neck to the leash, and the other end should drop slack when there is no pull on the leash. Before 4 months use a conventional flat collar to protect the tender young neck.

With the dog at the end of the leash, call its name and "Come" in a firm voice. If it comes, praise it lavishly and pet it. If it doesn't come, repeat the command and give the leash a light snap. Keep it up with firmer leash snaps until the dog does come. Do not forget the praise. Then switch to a longer leash or rope, about 25'. When it comes well on the longer leash, you should be able to go to off leash in a fenced area, etc. Once the dog is doing well, introduce come, treat. This is for emergencies only when the dog has gotten loose accidentally. Use it routinely and you will have nothing to fall back on when your dog is headed for a busy street. "Name, come treat!" is little different from the regular "Name, come!", except the dog gets a great treat when it comes. We are talking a hot dog, cheese, etc. much better than any treat you use routinely.

Relying on come to control most dogs loose outside is risky, and I do not recommend it. Dogs are individuals. Some can be trained to come when you have no way to enforce it, but some will never be completely reliable even for the most experienced trainers.

I have never seen other answers to such questions that sounded good to me either.  You might check the book Merle's Door and some of the references in it.