Okay, I don't know anything about cats in Greece (or Xena really), but I've never heard of them being kept as domestic animals in Rome. By 50 BC Athens would be part of Rome's growing empire so you probably need to look at domestic animals in Rome. At around that period Catullus' girlfriend had a pet sparrow. There were hunting dogs, birds- large and small, crickets I think but I haven't heard of cats, either domesticated or wild. I don't believe they ate them either so I'd assume they were pretty rare. And if they were rare in Rome they'd be even rarer in Athens, since the empire had considerably dimished by then. Whether there were wild cats though, I do not know.

I hope this was in some way helpful!