A deaf dog who turned "delinquent" after being raised in a drugs den has become the star pupil at his obedience school -- after being taught SIGN LANGUAGE. Tearaway mongrel Horus was so badly behaved after being rescued from his drug addict owners with his three siblings that no one would keep him for more than a year. But his luck changed when he was taken in by sign language enthusiast Rosie Gibbs, 30, who used Makaton - a basic form of sign language often used on children - to train him. Now five-year-old Horus is a happy healthy pet and has memorised 56 commands including 'sit', 'stay', 'pay attention', 'play' and he has also been taught to open drawers.