Try UGODOG. It's the latest thing in indoor dog potties. It doesn't require pee pee pads or litter. You can use newspaper inside of it if you wish, or nothing at all. It's very short (1 inch off the ground), and so it is easy for even the smallest puppies to get on and off of it. The grids are designed to cushion dogs' paws and are safe to use. It costs about $40, and that's it, no more pee pee pads or dog litter or pee stains on the floor.
Here's a link to the UGODOG website:
Replace Your Dog Litter Box with an Indoor Dog Potty | UGO PetCare