Some of these I don't think I posted.

1st video was his reaction to anything from rawhide, beef bones, squirrel, deer antlers if it still had bone attached etc.

I addressed this before his other behavior issues, because it interferred with any training. I discovered it by accident when trying to work with him. It made him so fearful you couldn't even walk downwind without him biting at the leash and panicking. For a hunting breed he can't have these reactions.

The second is an unedited clip of part of the process, and shows how I used my other dogs to speed the counter conditioning/desensitisitzing. 

Third is the success.  Rope tug still had some of the skin attached to it. In total it took about 10-14 days if memory is correct.