Screen Door Dog Door - Tips For Choosing Internet - Screen Door Dog Door Our cat doors can be grouped into 5 categories: models for windows, doors, walls, electronic, and models for units. You'll notice that there are many models in each category. We hope that you can find the right unit to fit your situation, depending upon where the installation is located and what function the door serves. We are available to help you with any questions. I Loved This . Choosing The Best Cat Door There are many factors to consider when choosing a cat-door. A cat door's weight should be considered along with the cat's size and locking mechanism. A door that allows a cat or kitten to enter and exit comfortably is ideal. The area is another important factor. Some owners would prefer their cat to roam freely in their backyards or front yards, while others will confine them to large patios. It could be that they don't want their cat wandering down the street, or t...