They get this idea that pawing is what makes the feed available. The feed must be removed immediately each time the pawing starts. He needs to learn to rethink the pawing, that now it's removing the feed. I watched a fence banger who thought this caused her feed to come. When I directed her owner to turn and walk away and keep his back to her, she got frantic with her banging for a few minutes then she stopped then walked away. That is when the feed was set down for her. The owner was consistant with this and her behavior stopped and no more fence fixing.