I use 4 Rubbermaid litter boxes that I bought at Petsmart and my cats love them. Here's the link: http://www.petsmart.com/product/inde...ductId=2755434. I also have 4 of the Petmate litter boxes and I only use lids on 2 of them. They're also from Petsmart but I don't see them on their website. Here's a link to them from another site: http://www.pet-dog-cat-supply-store....-flypage-10515. Mine came with lids but I took most of them off.

I also put cat mats around the litter boxes and I put the puppy pee pads on top of them in case some one pees over the edge or out the doorway. I've been using Dr. Elsey's Precious Cat Clumping Litter which is scent free and they all seem to love it. Here's a link to it:http://www.epinions.com/review/Dr_El...t_441887002244. I've tried the Feline Pine but didn't like the pine scent or the way you couldn't scoop out their urine. Good luck.