Is the dog dry food brand "By Nature" good for my dog?

My dog is a 8 years old female Yorkshire terrier. right now, we are feeding her, Royal canin and Hill's science diet mature adult small bites. one month ago, we were feeding her royal canin and Purina. just wondering if "by nature" is good for her. if not, please suggest me something else. one month ago, she have pancreatitis, but now she is fine.