I've had ZheZhe on Natural Balance Duck and Potatoe for about three months now. She had awful allergies. It has definately made a difference with her. I also give her Missing Link and this has also made a super big difference. I was feeling the same way, of not knowing if she was getting enough nutrients or not. Then as her treats she gets carrots and apples.
I'm really satisfied with the Natural Balance Duck and Potatoe.
p.wolfkill