There are many types of doors to choose from in pet supply stores. The doors come in different sizes to accommodate dogs from small to extra large. Some doors need to be installed in existing walls or doors; others come on a separate panel that is used as an extension to a sliding glass door. There are doors made of see-through Plexiglas panels that slide open with a gentle push from a dog, doors with acrylic flaps that open as a dog walks through, and even motorized electronic doors that are activated by a sensor in a dogs collar. Most dog doors can be locked to keep you dog inside or outside if necessary and to keep your home secure. Your doggy door should be taller and wider that your dog so he has plenty of room to get through.
Teaching your dog to use a dog door is pretty easy. Just use his favorite treat to lure him through the door several times. In a short while, he will be going in and out on his own.