I noticed Andy pawing away at an envelope that fell on the floor.
It wasn’t obvious what the attraction was.
He’d bite at the corner, lift it up with his teeth, then, finally got it flipped over.
The question answered: He was trying to get at the window, which I realized he intended to claw out, chew, and swallow!
I took the envelope away from the little rascal and put it where he couldn’t get to it.