Thay have another cat that lives there, and it is HUGE.

Fat.

Looks like a triangle when sitting.

It was on the edge of the porch, at the front of the open screen door. I thought it was a door stop, it looked like a caricature of a cat.

And then it moved when I walked by, very shocking.
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Edit:

On reread, and review the date on that article, I realize that it was an old aricle. I'm pretty sure that was the cat I saw.