What does the cat in "Once Upon a Time" symbolize?

The cat represents danger or ill omens. Since the 14th century, there has been a symbolic association with black cats and the Devil. Occasionally, it was believed that agents of the Devil, particularly demons and witches took the shape of these animals and, lacking a soul, appeared black. The presence of these animals have remained as symbols of misfortune or impending danger throughout modern works as well.