Hes 9 mths old and pulls and jumps on the lead especially if there is a car or cyclist! We started a while back with a gentle leader but this was not v successful as he still kept jumping and chewing the lead....we've recently tried a halti harness but he's now decided he can jump up on that too, get tangled in it and chew the lead grrrrrr. I may try attaching a second lead to the harness which I think you can do, to see if that helps...but wondered if anyone had any other suggestions?