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PlexiDor Performance Pet Doors for Dogs and Cats – Wall Mount Dog Door with Lock and Key – White, Medium Size

Amazon.com Price: $768.00 (as of 04/09/2023 23:27 PST- Details)

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Never buy replacement flaps again. Saloon style thermopane panels open fast and close tight. Keeps heating and cooling inside your home.
Accommodates dogs up to 40 pounds. Promotes exercise, good health, weight maintenance for a longer happier life. Able to withstand abuse from even the most powerful dogs.