find the right size. The door should be big enough to accommodate all the pets, but also as small as possible in order to minimize exposure to outside weather.
Pets usually make do with a smaller door than we think they need. Dogs tend to duck their heads and lift their feet as they go through, and the door should generally not be mounted flush with the floor.
The table below has some good advice on what size door certain dog breeds and weights generally require. You can download it here as a PDF file.
The tables to the right contains opening sizes and the necessary cut holes for different size PlexiDor door and wall units. It can be downloaded here as a PDF.
~ Maria Sadowski ~