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My parents' poodle unfailingly sings along (I call it howling) to one song, Edelweiss from The Sound of Music, and one particular commercial jingle. They did not teach her this behavior.
Nothing else causes her to even raise an eyebrow, so there must be some sort of aural discrimination in a dog's brain. Which would mean to me that they are affected by noise, and I would guess they'd let you know if it bothered them. If the dog or cat don't react or run from the room, then I would assume they're OK with the noise level.
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