Sure Petcare SureFlap Microchip Pet Door for Cats & Small Dogs with Curfew Timer, Compatible with RFID Collar Tags and Microchips, 1-Button Control, White, 4 x C Cell Batteries Required, Not Included

PetSafe Extreme Weather Pet Door Medium, Easy Install, Insulating, Weather Proof, Energy Efficient, 3 Flap System

PetSafe Extreme Weather Energy Efficient Aluminium Pet Door for Cats and Dogs – Insulated Flap System – Medium (M)

PetSafe, Aluminium Pet Door, Solid Design, Easy Install, Staywell, For Pets Up To 18 kg,White,Medium

Dog Mate Medium Dog Door, Easy Installation in UPVC Doors, Walls, and Wooden Doors – White

Ferplast Door for Medium Dogs Swing 11, Dog Flap, Universal Installation, Four-Way controllable Entry and exit, Anti-Draught Protection, Complete Tunnel, White

Dog Mate Lockable Large Dog Door, Brown (216B)

Dog Mate Large Dog Door, Easy Installation in UPVC Doors, Walls, and Wooden Doors – White

PetSafe Plastic Dog and Cat Door, Medium,For Pets Up To 40 lb,Paintable,Easy DIY Installation, Security Cover Included, Install in Interior and Exterior Doors or Walls, Durable, Adjustable Flap,White