Four Paws Wee-Wee Patch Indoor Pet Potty provides a convenient way to train your pet for both indoors and outdoors. The durable tray features a unique pour spout that makes for easy drainage. Dogs prefer to go in an area based on its texture and scent. This realistic dual-height dog potty grass with puppy attractant provides a natural feel for your dog. The Patch is an ideal training aid for both inside and out. Replacement grass mats are available and sold separately.