Paddy O'Hara was a year old in March. She is usually pretty good but her nickname is trouble or trouble starter. She responds really well to loud noises, stop it, or NO. What I can't seem to break is that she likes to mark in the dogs's favorite places so I decided to trygivingtime outs. They work for the most part but still she marks but not as much as before.I introduced her to time outs about 2 or 3 weeks ago. Now when I make one of the sounds that means to stop it...she gives herself a time out. She runs to her room and stays there for 5-10 minutes depending upon how much trouble she thinks she is in. It is super funny but it seems to be working somewhat.