Suggestions for Installing a Pet Door Through a Wall

Situation or Problem	Solution
Install the overall best high performance pet door designed to go through a wall	Endura Flap™ Pet Door for Walls
Share a wall mount between a very large dog (hence a large flap) and a very small dog or cat or you have a pet that you think will be particularly hard to train--It's very easy to remove Hale magnets for training purposes.	The Hale Wall Mount
A wall mount pet door for dogs that will chew the flap	DogWalk Pet Door for Walls
For a small electronic wall mount to be used by cats or very small dogs	A 305 or 306 Cat Mate Elite Series Electronic Cat Door and Wall Framing Kit
For a large electronic wall mount for big dogs, especially when you want to keep a cat in	Petsafe Electronic Smart Door
Your wall is really thick and you've got a cat	Use any of the manual or electronic cat doors with wall liners available. They'll go to any thickness you need.
Your wall is really thick and you have a large dog.	For a manual dog door, the Hale Pet Doors for Walls can be ordered with a 16" tunnel length. Otherwise, frame the wall yourself (or hire a contractor to do it for you.