This is a high quality artificial grass replacement pad for pet potty patches measuring 19" x 12". It has a penetrable back allow liquids to pass through for us with dog potty pads. Synthetic grass mats should be washed every week and replaced every 3-5 months. This replacement mat is used for Dog Pet Potty Training Pads. The Pet potty training pad is the unique solution for pet accident-free living. Perfect for when you're late coming home to let the dog out, or unable to let your pet outside due to bad weather. Ideal as a training tool for your puppy, it's also great in assisting an older dog that might be unable to go to the bathroom outside.