OP, I forgot to add, you can try the pet door and make sure it works for you. I did modify it so it could stay in place and keep the house locked, and as I recall it has an insert to keep your pet in and any predators out. We never used this as this was used in the lanai, and it let the kitties out to the birdcage, not the great outdoors.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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