Clay Pot Plastic Pots What Ever.... You Can Get The Cheap Lil Plastic Nursery Pots And Set Them Upside Down With Hols Cut In Them For Doorways... Whatever You Have Or Can Get Ahold Of For The Least Amount Of Expense Will Work. Heck Even Pieces Of Plywood That Fit Inside The Brooder, Just Lean Thenm Up Against The Outer Walls And It Makes A Visual Barrier....a Meanie Cant Chase And Bully What He Cant See