Awww crud dbg, I just read this.
I am so sorry you are going through this.
Are you doing the liver raw? I know when I was giving Brownie his liver every day he loved it raw. When he got to the point where he wouldn't do the raw any more I cooked it very lightly in the microwave for a few seconds. It got him interested in eating it again. I figured liver, like any other foods once it is cooked, loses some of its' nutrients.
Again, I am sorry. Many
coming yours and Raggs' way.