Oh good I'm glad you don't use the store stuff, a lot of times people do because they just don't realize how dangerous it is. That makes me feel better. Most of the time a puppy doesn't really need puppy food, they are usualy fine with adult but because she is to tiny it reallymight depend on teh size of the adult. It may be too big for her to eat comfortably even if the nutrition aspect was okay with it. My dogs never had puppy food, they had all life stages like canidae and had adult chicken soup but I don't know about Nutro, never used it myself, so I don't know about the size chunks, might be good to stick with the puppy to start.