If you are a homeowner and you wish to keep pets in the long term, a flap or pet doors for walls is something to be considered. There are many advantages to having them. Your house has several walls leading outside so you have a lot of choices for installing them. You could place them anywhere in your house. You should however, take some safety measurements and find out or know where the electrical wirings or plumbing pipes are before installing a pet door. You can purchase a laser wall stud finder from the local hardware shop to detect any wirings or pipes located inside the wall before you knock the wall down. Consider buying a customized pet door that can easily be fitted inside the wall. This way you won't have to think about messing up the measurements. You can always repaint that wall anyway. Usually every household has a few tubs of paint lying around in their garages or basements. Don't forget pet doors must be framed as the wall is not solid. Between the wall there are studs around 16 inches apart. These pet doors are created to fit the studs. However, you will still be left with a gap top and bottom. The wall has to be protected by a sealant so that insects, damp and air don't seep through. A good quality, varnished and treated wood is ideal. Many stores that sell pet doors offer a self framing kit for this purpose, however you should make sure the wood is cedar as this type of wood is termite proof. For a more complete look on both sides of the walls you should consider a double flap pet door. Double flap pet door is thicker and fits tighter into the wall to keep the weather out. Of course you can safely lock your pet door whenever not in use. There are electronic transmitters that actually are placed into your pet's collar, which allows the door to open ONLY for your pet and no other animal. Surprisingly, having a pet door can increase the value of your home. There are many families with pets in all shapes and sizes. Once you install a pet door, one is able to enlarge it or make it smaller depending on the size of their pet. One last helpful tip. If you own a small cat or dog, consider installing the pet door above the skirting board so that they can step up on it. A simple brick or concrete block would do the trick and it will clean their paws if they get muddy.