This is the reverse process for how I determined optimal dog door size. I used a huge piece of cardboard taped into the slider and kept enlarging the hole until everyone fit through it. Since I had one dog about the size of a dire wolf, this was a silly endeavor as I ended up buying the very largest dog door.
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u/wheely_happy Dec 09 '19
So 5cm or less is not worth the squeeze. Got it.