Why does he do it?!?!

Question:
 I have a 10 month old cross breed who keeps running away. We have had him since he was about 4 months, at first he was only allowed in our back garden as we got him from a rescue and so we didnt have any info on shots so we needed to ge them done. At first he would just go in the neighbouring gardens and we would call him back and most of the times he would come (eventualy) now any time he gets out of the frount or back door he is of like a shot. Calling him doesnt work he just runs, he reapears later byt sometimes he had a scratch and I am worried as we live in a village were the people drive like complete nutters and I know of a dog who got run over and killed just round the corner from me. My last dog who we had put down before we got this terror never ran away, she wouldnt wear a lead for walks but it didnt matter cos she didnt chase cats or owt and ignored other dogs (our neighbours dog nipped her she just growled at him and carried on walking, so I stood in the middle and told her to go home which he did) so I dont know what to do? We have got a behaviourist but it takes her a while to come as she is always booked up and has small children. Our neighbours have said that their dogs often run away to the field which makes me worrie more as Cookie has no manners with other dogs and the field often has cows or horses init. I have caught him at a neighbours pond and I dont want him to fal in cos he is not steaddy on his feet.
Answer:
 Thankyou for replying so soon, I have tried the games and clling tehqniques you have suggested (I have read them from one of your earlier posts) and were just wonder how do I make myself more interseting to a dog who loves all dogs and wants to play with all dogs and children? I have tried talking high pitched, clapping, kneeling down, running around, jumping, calling all seperate and together (well not running and kneeling down lol) but he just doent respond, he chews thruogh any lead which isnt chain so we are struggling for a long lead (he gets very tangles in long chains and the last time I tried it he bit the chain and cut his mouth). He runs away while we are playing if we are in the garden or when he is even to tried to play fetch, he just shoots of for no reason, he has only done it in the one place, he runs into the neightbours garden and then through many other gardens to one which has a pond then into feilds, non of the gardens aroung here have much in the way of fences and even if my parents thought about it would cost a bomb as the borders of our gardens are done by trees and bushes, and the neighbours would go mad. I am still working on his recall.
Answer:
 Often dogs do this because: 1) They can escape and have learned that humasn cannot get them back if the dog does not want to. (Check the fence and such, most dogs need a six foot high fence at least and then lpook for areas they can dog under, etc). 2) They are bored and are looking for more activity - the grass is often greener when you get out and can explore. Enriching the yard can help make the dog feel more stumilated. Dogs hate the boring and will seek the exciting. 3) Dog has not been taught a good "recall" (come when called) that is practical. Most classes teach "Sit, stay, call the dog" That is so not real world. This is how I teach comong when called - real world. OMING WHEN CALLED: Having a dog that will come reliably when called is a great asset. However, this does not mean you can let him run loose. Even the best trained dogs may slip up: a cat may cross its path; squirrels are great to chase; kids on skate boards; escaped dog panics and will not return. Just because your dog returns reliably most of the time is not enough. Very few dogs can be trusted off lead. It may take years of consistent training to get a dog this way. Before we begin teaching COME, I want to emphasize NEVER EVER call Puppy to you then punish him REGARDLESS OF WHAT HE DID! In a Puppy’s mind, he is being punished for coming to you and not for eating your $1,000 Gucci bag. Forgetting this fact and punishing after calling him can make Puppy scared to come when called - a very bad thing... I cannot emphasize this enough... NEVER EVER CALL PUPPY AND THEN PUNISH! You want to belike an Ice Cream Sundae to a child as opposed to a bowl of steamy spinach. What would the child rather have? Would a dog rather have fun or not? Ice Cream or Spinach? Now that we have this straight... COME Start with your dog on a six-foot lead.  Allow him to get interested in something. Walk to the end of the lead, make sure the lead is loose and HAPPILY call “[Name] COME!" If he ignores you, move cloer, get more exciting, repeat the command and start praising as soon as he turns to you. You may clap your hands, take a couple running steps back, crouch down, anything to make you more interesting than whatever was on the ground.  Do this exercise on various length leads with mild distractions. Remember the more you have to work against to seem like an Ice Cream, the harder it will be to get your dog to come. At first, you need to be the most enticing thing there. As soon as the dog gets to you, BIG praise and reward, make this the BEST thing in the world! If puppy fails to respond, MOVE CLOSER! A distance or distraction too much for your pup at that time does nothing to teach the pup to come - it can teach him to ignore you instead. Teach your dog that you or family members can also call him away from people.  Put the dog on the long lead - you can use a sturdy length of close line. Just make sure your dog is attached to something. Have a helper hold the dog.  Go to the end of your lead and crouch down. While holding the lead, spread you arms wide and in your most happy voice say, "[NAME] COME!"  Clap your hands make a FUN ruckus make him want to come to you above all else - even Prime Rib could not keep him from you! When he gets to you comes, stop him in front of you and PRAISE. At first, just have the helper hold the lead and NOTHING else. They should be totally ignoring the dog. Gradually move to a hand being on the dog, soft talking, etc. Do "Round Robins" where several people are in a circle.  Toss the lead from person to person; each person with the lead calls the dog. Then they hold the dogs while the next person call the dog. Always praise and keep it fun! Play Hide and Seek. Have a helper hold the dog or let the dog get interested in something and then you silently slip around a corner – KEEP IT VERY EASY AT FIRST. Call the dog and get the dog really wanting to come find you. Gradually get harder and play this game both inside and outside. This will help teach that even if you cannot be seen, the dog still has to come and find you. If you start to get frustrated and your voice shows it, STOP, as with any exercise.  You do not want to make this unpleasant.  Neither do you ever call a dog to you and punish him - no matter what he did. Dog's think differently and will not associate the punishment with the action he did before you called.  He will associate the punishment with the action of coming to you. Puppy's life could depend on it.