Iams is actually a perfectly good food. We feed it. Is Sierra doing well on the Iams? How do her stools look? If she is healthy and happy on the Iams and has plenty of energy, I would be extremely hesitant to change foods. We tried Tucker on all kinds of supposedly "better" brands of food, but they were all way too rich for him and his stools were a mess and he was having much more frequent bowel movements. There is no one food that is right or better. All dogs are different. Some do well on the more "premium" and higher protein foods and some don't. After we started Tucker on Iams large breed, he was 100% better and had nice, firm stools and he has a nice and soft coat, plus has a ton of energy. Lots of people try for months and months to find a food that their dog does well on, so if she is doing fine on the Iams, I would stick with that. My theory is that if it isn't broken, don't fix it. Of course, it is totally up to you if you really watch to change. Just make sure to do it slowly.