I've been using freeze dried liver, but I have also used this for all his other training as well. So I will try switching this up. He is very food driven that I cant tell if he enjoys a certain food over another.
When we go into the bathroom he used to come in to sniff around but now he will stop at the door. I think we pushed him too far so I will take your suggestion and try starting over with baby steps.
Thanks for the thorough response. Also, how can you tell when dogs love a particular treat?