Illness, Death Dog Nutro Pet Food

Thank you Labman! My dog has been eating the Nutro Ultra (the "Holistic" version) since she was a puppy. She's been on the adult version since six months and it has done wonders for her loose stool issues. Nikki, my rott mix is apparently healthy with no issues at the moment. I didn't see anything about this version, however I don't want to take chances. I think I am going to try "Blue", someone told me it has very similar ingredients and nutritional breakdown. Should I try to to do it over a day or two or just throw out ALL the Nutro ASAP and get ready for her tummy to freak out?
Thanks again for the heads up!