For Aluminum Sash Doors/Chrome Steel/Security Pin Lock
To determine the correct size door, simply measure the width (A) and height (B) of your pet.
(A) Measure the widest point of your pet's shoulder.
(B) Measure from the top of your pet's back (just behind their head) to the bottom of chest.
Pet door models have different size openings. Just make sure your new pet door's opening is both wider and taller than your pet's measurements to ensure they can comfortably pass through.
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Incredibly easy to install
Incredibly easy to install. I especially like the feature that lets me set the door so the cat can come in but not our in the evening. The Youtube videos show you how to do it.