Hello, my 8 month lab who previously wasn't remotely distracted by runners/cyclists etc. is now chasing after every one that runs past. I have tried Pippa's recall training approach, (whistle) and all other types of treats. In the end the only thing that seems to stop him in his tracks is the word ball and waving one. So now I have another issue that he is obsessed with the ball. Given all the other posts on chasing runners etc. on this and it seems that there isn't any real definite solution - do you think it is okay to just let him love a ball (even though I have been told by trainers that you should not allow a dog to get obsessed with ball throwing). I really do not want to put him on lead for the next 5 years! Thanks for any advice.