So we have had Cooper for a week today. Up until today he has been with us all the time, housetraining has been going really well, not a peep at night etc. Today my kids had a friend over. Whilst he was here Cooper peed in both my kids rooms, the downstairs bathroom and kitchen, i had to leave him in his crate for 2 hours. My 7 year old Shih Tzu was also in the house, he just sleeps on the sofa the whole time. We arrived home just as the sun was setting. Walked through the gate and heard him barking. My heart sank! Our Shih Tzu never barked as a pup. I know it's early days but Cooper will have to be left at times and i'm now feeling worried!