Finding the right dog door can make life easier for both you and your dog. Here's everything you need to know about dog doors.
Expert Tips - Dog Doors: Purchasing and Installing

Expert Tips - Dog Doors: Training Your Dog
After you purchase and install the ideal dog door, you'll need to train your dog to use it. This doesn't have to be a difficult task. Simply put your dog on a leash and place her outside the door. From inside the house, call to her and pull gently on the leash. If you have a manual doggie door, open it physically with your hand to show her how it works. Keep calling to her until she goes through. Praise her generously and offer her a treat.
If you have an electronic door, you should hold the collar that contains the activation chip so you can open the door as you desire. Place your dog outside the door and kneel down beside her. Move the collar to the door so it opens, and have someone call to her from the other side. When she goes through the door, praise her and give her a treat. Have the person inside the house do the same thing with the collar until she goes through the door to the outside again.
With just a little training and practice of these expert tips for dog doors, your dog will love her newfound freedom.