Our latest mix is
Chicken Soup, Natural Balance, Royal Canin, Wellness, and Canadae. I've always mixed foods and I will throughout their lives. Wellness is a new one I recently added in place of another, but the pieces are big and I'm not sure if that is why she will leave it or if she doesn't like it. I'm going to smash a few into one of her meals and see if it is the size or the taste.