My Tawny was eating Nutra Lamb and Rice and all of a sudden it started making her sick, she now eats a premium dog food, of Potatoe and Duck, wow is it expensive but she loves it. I was told that sometimes they just need a change, chicken does horrible things to her and beef makes her smell. I have to take the new food out when she is not around or she'll start barking really loud for it. I guess a retreiver knows when there is a duck around.