Well after a year of training to no avail we made the decision to put the old fellow down. It was not an easy decision but you do what you must do. So far the other 3 show no interest in getting in the chicken coop. I hope it stays that way.
i have an older german shepherd who must go because no matter what i do he will break into the chicken coop and kill the chickens. I have invisible fencing around the coop and he wears 2 shock collars, he does not care, he just ignores the shock and will dig to china, he bites the chicken wire...