I used to fill a spare sink with water for my cat to drink out of. Recently the plug has started to leak, so it empties out. When my cat is left alone and the sink is empty, she will dribble pee in the sink and on the counter around it. This is the only abnormal bathroom behavior. She has a drinkwell fountain, so she has plenty of water. Why would she keep doing this, just because she is mad and wants water?