Convenient: Provide pets with freedom to enter and leave the house whenever they want. Pet accessory: Grab yourself a pet door flap. Modes: 4 locking modes - set to your preference. Size options: Choose from either small (19cm (L) x 19cm (W) x 2cm (H) or large (25cm (L) x 23.5cm (W) x 5.5cm (H)). Pet Door Flap | Small | Living Social