I have a three year old Aussie Shepherd that I am trying to introduce to my new flock. He has never been around chickens before, so everyone is new at this. When he is allowed to roam free, he is running straight to the coop and refuses to listen or obey any commands. Today he started pawing and biting at the gate and did some damage to the wood. I have held chicks right up to his face and he won't even look at them, but will immediately try to get at the rest of the flock. Anyone tried correction collars? I am willing to spend some time training, but these are supposed to be rangers and there is no way I am letting him near them unless something changes drastically.