Pet Doors business. Business Overview There are estimated to be more than 30,000,000 house pets in North America. And if you have a dog or cat, then you are well aware of the fact that they may have to get outside for a host of reasons. Unfortunately, once in a while our schedules conflict with our pets' call to nature conflicts. Enter the solution: the installation of a pet door enabling dogs and cats the freedom to enter the safety of a fenced yard regardless of the time of...