Before you start cutting into one of your doors to install a pet door, be sure to do the prep work required to do it right. Take your pet’s size into consideration. The pet door should give your pet about 2" of clearance all around. It is important to get the correct size pet door because not only do you want your pet to be able to move freely in and out, you don’t want an unnecessarily large opening that could be a possible security risk. Once you know the size of your pet, you can then find the correct size pet door at your local True Value hardware store. Usually, pet doors come with everything you need for installation. Don’t forget if you have a puppy or kitten, leave enough room for growth.
Install a door with a sturdy two-flap design and weather-stripping features. These effectively shut out any drafts from outside to save on energy and keep out the elements.
Choose a model that comes with a removable interior door panel that closes the opening when you are away or if you want it securely shut overnight.