Alas, Piano*Cat passed away about a year and a half ago...
I dont have a cat - but until recently our dog (Xena the King Charles Cavalier Spaniel) may have been a contender for "Piano*dog". She sleeps for approximately 22 hours a day (being an old dog) - and manages to ignore almost all manner of noises coming from the Piano, but she DID have a habit of waking up and coming to investigate whenever I played the slow movement of Beethovens Pathetique... No other piece of music seemed to get her attention - but any time I started playing the Beethoven she'd wander into the room approach the bench and see whats going on.
I have no idea whether there's something deep in this particular work that has an effect on a canine amygdala, or whether I had subconsciously got into a pattern of playing that just before feeding her and the association had somehow stuck - but I'm sure it was something truly remarkable as I'm almost sure she could identify that piece distinctly from others!
Alas this behaviour has stopped (I dont play the Beethoven so often any more and I think the dog may be a little hard of hearing these days anyway) - so my chances of a creative piece of research resulting in a PhD in Psychology have no doubt passed.
[sorry - completely off-topic!]