I have always crate trained in crates that have an elevated epoxy wire grid floor, and I put a crate mat on that. It takes the puppy next to no time to figure out that if he/she absolutely CANNOT WAIT ANOTHER SECOND they can push the pad aside and urinate through the grate. Pad flops back down on top of the grate and all you have to do is pull up the grate and clean the floor of the crate. I seriously don't know how people crate-train without these. Puppies ARE going to have accidents in their crates at first and it sure makes it easier on everyone when you don't have to wash both puppy an