Big Lots Bags

So I have been working at Big Lots for a while now and usually I always find something that I need to buy there. Sometimes that item happens to be cheap dog toys or dog cookies/treats. Well, apparently Houli can read now because she figured out that every time I bring home a Big Lots bag home chances are good that there is something in it for her. (Usually this is not the case.) I don't know if she can see the color orange or that she can look at the letters, but she will sit underneath the bag for hours until I show her what is inside. Even after I do that, she doesn't always believe me. Maybe it has a certain smell, but she doesn't do it for Walmart bags unless she can smell the cookies. When we went shopping today and brought home bags from Big Lots and Walmart, she automatically ignored the Walmart bags and went straight for the Big Lots ones. I don't know how she does it! This is quite a mystery.