He walks beautifully on the lead. I can even get him to walk to heel without the lead quite well and his recall is coming on really well. But I started running with him last night - first time I've been running for months and I need to get back into it - and he went mental chewing on the lead! He grabs it and then sort of moves up it until he's almost biting my hand. I think he just gets overexcited. If we are running through fields I can take him off but where we live there is always going to be quite a bit of pavement running sadly. I stop, tell him to stop and he lets go but as soon as we start running again he chews it!