If your walls are thicker you can buy a door mount and build your own tunnel.
Locking pet doors for walls.
It features a three sided power magnet to ensure it stays shut even in high winds and includes a clip locking cover to guarantee it stays secure when you re away.
Depets large cat door outer size 9 9 x 9 2 4 way locking cat flap door for interior exterior doors weatherproof pet doors for cats doggie with circumference 23 suitable for window wall 4 4 out of 5 stars 1 678 16 99 16 99 get it as soon as fri sep 4.
The plexidor can be installed in walls up to 12 thick.
The hale pet door for walls can be installed in walls up to 16 thick.
Endura flap pet door double flap wall mount best extra insulated all weather energy efficient aluminum dog door small medium large xl black tan white doggy frame well built doggie locking cover 4 5 out of 5 stars 305.
The endura flap can be installed in walls up to 8 thick.
Some are more high security dog doors such as the hale or endura locking cover.
Sliding covers are not interchangeable across brands without modification to the cover or the door.