My 2 year old shih tzu male dog has suddenly started pooping and peeing when left alone. Prior to this he was very clean at home and would never soil. When we first got him he was 10 months old and toilet trained. He is left for 3-4 hours in the morning and has had no problems with this before, and there doesn't seem to be anything physically wrong with him. Have tried cleaning up the mess without scolding but cannot see any sign of this behaviour stopping. Please help!:confused: