I have seen those but I fear the restricted opening will bother DW (Darling Wife) and I. We are not large folks, but the door will only open about 2 feet with one of those in place. I guess it is worth a try at only a buck thirty. Another poster in another thread said that rats and snakes may try to get in. If we do a doggie door, we'll also do one out of the lanai. This is for dogs, not cats, and we have a CYV.
Don & Kaz
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