Why does he keep running off

I have an 18 month Staff cross who keeps running off into the same places. It's a new thing that he does but why? Can someone help me? Why does he do it and how can I stop him?
Emma Pickersgill, via facebook

Sounds to me that Emma has to become the most interesting thing in the park and really work on her recall. Anyone any tips?
Beverley Cuddy, Editor

Karen Wild, behaviourist advises:

Hi Emma! If it’s a new thing it may be that he has had one or two extremely enjoyable experiences after running away and then realised that he can continue his fun no matter what you do! There are a few things I would use to help. Firstly I would get a long line (30ft training line, or washing line if you like) and attach this to his collar so that he trails it along. Never let the line get more than halfway along its length away from you as you walk. Secondly, arm yourself with the tastiest treats you can find, plus a toy he loves – squeaky ones can be good. Finally, as you go for your walk practice calling him back after only a few feet, and keep it up into a great game. Get him to chase you by running away (as long as he does not grab or snatch). Build this up into such a game that the second you see him alert to something in the distance, you can grab the line, call him, run away and offer him a treat too. What dog wouldn’t want to be with such a fun owner?!