The mill outside is a must. Machobuck was terrified of the ceiling fans. if you turned it on, he would leave the room. If you turned it off, He would come back in and chill. I'm not sure what it was. I just know he hated ceiling fans. If I were you, I'd put the mill in his chainspot to see what would happen. Also, let another dog run it in front of him and praise him. Some dogs are jealous.