I read reviews before purchasing but thought I'd try them anyway despite some saying they leak.I'm not sure how it happens. I've used pads for years for my smaller dogs to keep them from peeing all over the house, and they do have a habit of not peeing on the pad all the way, thought this might help with that, nope.I use Costco pads, they are too big for this pad, so I folded it hoping that would help any leaking.This is made of flimsy plastic similar to a thin rubbery car or kitchen sink mat. TSee full review