Not sure what you have under the shavings but I would put a trashbag or something underneath to keep the pee and poo from soaking into the wood or else it's going to get REALLY stinky in there REALLY fast! That's why I think people use the rubbermaid totes b/c you can hose them out everycouple of days and start fresh??? They do sell HUGE totes at Target for cheap...just a thought...but maybe you've already got it covered???