When I first got Sadie, I ordered WIZDOG and wasn't at all impressed with it. It's made of plastic with a wobbly plastic grate that fits on top of it. Sadie wouldn't go near it. Simple Solution Pee Pads have worked out great. She's only 9 months old and has been 99% trained on them for at least 6 weeks - which I think is GREAT for a Yorkie!!