Police have launched an urgent search for a 14-year-old girl who disappeared after taking the family dog for a walk. West Yorkshire Police said Isabella Hayward, known as Bella, was last seen at about 12.30pm yesterday when she left her home in the Allerton Bywater area of Leeds to walk the family cockapoo, named Cooper. It is thought she may have entered the St Aidan’s nature reserve. Officers continued to search the area on Saturday. A statement from West Yorkshire Police said: "Police are