I remember dorasdaddy, I think it was, saying that you can return food bought at Petco within 30 days, if you have the receipt. My mom wanted me to double check that you can return it, even if you have opened the bag of food and used a little bit of it. I'm asking because I tried giving Lily some CSFTCLS, but she doesn't really like it. But I don't think I can return it to the store I bought it from, so...I have nearly 6 lbs of cat food to try and give away. :roll: I'm planning on trying her on Natural Balance Green Pea and Duck, and Solid Gold Katz-N-Flocken All Life Stages, and see if she likes them.