Anybody know how I can get dog to stop pulling on the leash? I am dog sitting and the owner is away for a few months. When he pulls, he turns the opposite direction and forcess himself out of the collar over his head. It is harming his neck so I bought him a harness and tightened it but he ends up pulling it off like a jumpsuit. I can't leave him loose since there is livestock behind the house, and he's already killed half the chickens there. Any help??
He is around 70 to 80 lbs.