Female Shih-Tzu won't stop peeing in the house
I have a 4 year old unspayed female Shih-tzu. She is walked every hour and she is still peeing in my room. Once I walk into the room and notice the "accident" I call her name and point to the mess. She hovers close to the ground and wagging her tail as if she knows she is in trouble. I have tried numerous ways to get her to stop. I've had the carpet cleaned, I've punished her, and I take her on long walks throughout the day. When she is walked she will refuse to go. She will find a spot and act like she is about to go and then walk away. Can anyone give any advice on my situation?? Thanks B.