Your large dog can easily let themselves out with the 2-way dog flap. Set it to unlocked to give your pets more freedom, or to locked if you don’t want your pet using the door. This cat flap from PetSafe can be installed in just three simple steps. It is suitable for wooden doors, PVC, uPVC, and metal doors, as well as brick walls. The insulation frame attached to the flap and the magnetic closure at the bottom make this cat door windproof and secure with its two locking options. The dimensions of the PetSafe pet door are 45.6 x 38.6 cm; maximum shoulder width is 29 cm. It is suitable for large dogs weighing up to 45 kg. With this pet flap, your pet has access to designated areas and can move freely within them.