In a little over a month Wrigley (3months) will have his series of shots completed and it will soon be time for me to start taking him on walks, ob training etc. I have started to try and get him used to his leash. I was told to put it on him and just let him run around with it. However, every time I put it on, he just rolls over onto his back and starts chewing the leash. Does anyone have any advice on what to do?