My wife and I have 3 cats ourselves. We always keep a water resistant cover over the Yamaha keyboard we keep in the house. So far so good. As far as my Casio and other more professional music equipment, I keep that in a separate little heated shed (my "man-cave"), so this problem wasn't due to our furry children. No, somehow something got into that jack while lugging the keyboard back and forth for practicing with other band members.