This was a really fun cake to make and eat! I followed some other reviews on the recommendations as follows: I used Little Debbie brownies. They are easy to handle and mold. And you can get quite a few poops from one package of brownies! For the litter I used almost one entire pack of Golden Oreos and crumbled them in the food processor. I used one box of Butter cake mix and one box of Devil's Food cake and baked both of them together to save on pans and clean-up. I just baked them for a longer period of time. (You're going to crumble the cake and mix it together anyway...) I used one pack of Vanilla pudding and one pack of Butterscotch flavor. For the added reality effect (as if this needs more reality?) I used my fingertips and made paw prints. LOL It tasted good, and in my opinion it tasted a lot better the next day after the pudding was able to soak into the cake!