We installed a doggie door from Lowes that is part of a screen door. It is great because when we are home, we can open the door and they can go in and out as they need.....but when we are not home the regular door is closed. It was very easy to install and does not let too much hot/cold air in/out....so it has not increased our utility bills. We also have a small grass area that is part of our patio and enclosed....so they can not get out into the yard if we are not outside. We have hawks and coyotes in the area and do not want them outside without someone watching.
Good luck deciding.....there are lots of options. (Our neighbor has a yorkie and she installed a doggie door in a window instead....and she is pleased with that option also.)
__________________ Sheryl & My Grand Puppies.....Sailor Bear and Lil Mis' Magic  Supporting Courtney |