After much research and checking, I have decided to switch AJ from Pinnacle, a very respectable brand, to Instinct Duck and Turkey. I am doing this because of the tapioca content of the Instinct, which is said to help his arthritic shoulder. Of course, this change will take several weeks and use the rest of the Pinnacle I have on board. I will be watching for improvement to his arthritis. I am also doing this in hopes he will stop his occasional shedding of dandruff.
So far, he seems to like the flavor of the Instinct. We'll see how he does.
On another note, I am trying something different for his incredible butt-breath. I have PetzLife oral care spray that I will try on him. He has some tartar and this stuff is supposed to clean it off by enzyme action. According to what I read about it, it should show improvement in about ten days. I will let y'all know.