Nothing is worse than installing a doggie door and finding out that it just won’t work right. There are many doors available, both online and in stores, but this is definitely an area where buying quality is worth your while. Flimsy flaps, poorly manufactured seals, and doors that aren’t built squarely are all common problems with cheaper models.
If you are going to put doggie doors in your wall, it is especially important to have the correct size and construction. You will probably need to frame out the space in your wall, and while minor deviations are manageable, large ones are a nightmare. No amount of shimming will get a door to sit straight and stable. A well mounted door is barely noticeable; a poorly set one is an eyesore.
Quality matters just as much if you plan to use your sliding glass door. These units are designed to fit within the tracks that the door already has. The right size, height, and fit are critical for proper operation. You don’t want your dog to run out the door and find himself entangled in the dog door which pulled out of place due to his enthusiasm.
If you can, test the door yourself. Look for plenty of magnets on a flap to seal the door well against the elements. Look for product reviews online. Try out the locking panel to make sure it is easy to install and remove. Look for some sort of locking mechanism that is more than just a sliding panel for security. If you are purchasing the doggie door online, check the return policy.
A good doggie door is a real asset granting you and your dog additional freedom. A bad version is not worth your time or money.