I have a dog door, it's a good one. Cost around $200 . It has magnetic strips and brushes along the edges of the flaps which are double flaps for a good seal. We have coons and possum but the door has a slide in cover which I put in at night. Never had a problem with anything getting in the house, not even a mosquito. You get what you pay for I guess. I could not deal with letting them in and out. For one, I don't like dogs, that's my wife's thing. Sore subject for me because she got two dogs while I was away without telling me.
@beastmode:
Well, stop going away! (I kid) 4951