While not deaf, we have a cat thats pretty blind.. we used to think he had an attitude problem because he'd always just scowl at you from across the room.. Later found out he has like zero depth perception, and he wasn't scowling - he was just focusing to try to see wtf he was looking at
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Also, possible that they felt the vibrations from your raised voice rather than the sound itself!
He plays dead until he hears anything that might mean he gets a treat
And when I say he plays dead I mean laying on his side completely limp, eyes open and just gazing ahead into the void