Got a buddy needing some help. He's trying to teach a 1 year old lab some basic OB. He's taught basic OB to plenty of dogs. She fights back really hard and lays down to fight the cord when he's teaching heel. He's never had that happen. She always walks behind him and every time he gets her to his side in the heeling position she falls back just looking down. He said she's doing a little but better but what does he do if she continues it.