First of all, shipping: the tray was placed in a gigantic box filled with paper for protection, but still was crushed during shipping. The product I got was damaged and had a corner chipped off + I didn't know what to do with a box that could have been used for shipping a medium-sized fridge.Regarding the way it works: it doesn't, at least if your dog is determined. The tray is supposed to keep a wee wee pad in place and facilitate cleaning, but my dog had no problem removing the pad and shredding it into pieces, no matter how hard i tried to press together the two parts of the tray. Securing the sides is simply not enough, as a dog can still easily rip the pad in the middle, using his paws or teeth.In conclusion, maybe it works for some dogs, but not for the energetic and determined gentleman of mine.