We are looking for protection that would protect the cargo compartment, including having the rear seats folded down, from our three mid-sized dogs. Any suggestions are appreciated including alternative and eco-friendly materials (aka recycled stuff) are greatly appreciated. Thank you, Mike P.S. - This is the best Prius forum I have ever found. We have owned at least one Prius since 1999 when one could pre-purchase via the Internet. Just love these cars.