"An innovative solution to house training issues! The Wee Wee On Target Trainer has fasteners where the pad is anchored in place- the pet cannot move it! Made of high impact plastic, the three sided, 'corralling' feature of the Wee Wee On Target Trainer prevents 'missing the pad'. Once the dog is trained to use the center of the pad, the side walls can be removed. The On Target Trainer fits all standard puppy Wee-Wee Pads (22” x 23”). One free pad included! "