One of my current cats will graciously permit us to sing -- the other one bites us if we sing in his presence.

We used to have a cat who loved the tin whistle -- but only when she was pregnant. All other cats have run howling away from it.

My sister had to give up learning the violin because all of her cats (4 or 5) would climb up her legs and howl every time she practiced.

My brother-in-law used to sing to his dog --when he sang, the dog would howl (I would have howled too, to be honest....)