Here is a pet door that doesn't require a people door. Great for hiding your pet door in the laundry room, garage, or behind a couch. Telescoping tunnel allows you to install in your wall. The Wall Entry can be installed in siding, stucco and even brick. 

• Plastic Telescoping tunnel to accommodate both 2" x 4" and 2" x 6" construction.
• Double flap construction with adjustable sill and extra strong magnets ensures excellent insulation factor.
• Durable aluminum frame
• Includes a non-rusting locking closing panel
• Extension kit sold separately to extend 4" beyond 7-1/4" thick walls