tried every collar going, the head collar he managed to get out of, the other things we have tried we have now found out that they can cause alot of pressure on the dogs body ie the harness that lifts the front legs if the dog pulls. The one thing we have tried and has sucessfully worked was the barking deterrent collar, it lets off a high pitched noise, that worked so well i only had to show him the collar and he would calm down.. Like i said walking him is the main problem, he hasnt socialised properly with other dogs outside of the house, he has live with a few other dogs fine but he just gets far too excited when he sees another dog and he looks like he wants to eat them but when in actual fact he just want to play.. this is all being corrected whilst he is away