The trays are designed for use with PAW TRAX Super Absorbent Doggy Pads. The snap-in frame holds the doggy pad firmly in place and keeps dogs from chewing the pads! The tray provides superior protection to floor surfaces when used with doggy pad. Perfect training tool for puppies and mature dogs. The trays are designed for use with PAW TRAX® Super Absorbent Doggy Pads. The snap-in frame holds the doggy pad firmly in place and keeps dogs from chewing the pads! The tray provides superior protection to floor surfaces when used with doggy pad.