I use puppy pads in the Dog Litter Pan my 3lb Maltipoo loves it and that makes me very happy!!! He took to it right away, much better than the puppy pad holder and this is large enough to get maximum coverage and use out of a 22×22 puppy pad as shown in the picture. I have it inside his Iris 4 panel pen along with his crate and other items you can see in the picture. He now does not have to wake me up during the night to “go potty”. I just change his pad out in the morning before I feed him and all is well in puppy land! I wish i had bought this before the puppy pad holder and saved my self the cost. In hind site if little Onyx ever starts to raise his leg the Dog Litter Pan has tall enough sides to cover that as well.