` Everything is down to the owner , '' he told CNN . NEW : Animal psychologist says dog owners must take action if they spot warning signs . Jade Anderson , 14 , is apparently killed by a pack of dogs in a house in northwest England . She was found dead on the floor with her throat slit and her body covered in blood. Media reports say they were an American bulldog , bull mastiff and Staffordshire bull terriers .
NEW : Animal psychologist says dog owners must take action if they spot warning signs . Jade Anderson , 14 , is apparently killed by a pack of dogs in a house in northwest England . She was found dead on the floor with her throat slit and her body covered in blood. Media reports say they were an American bulldog , bull mastiff and Staffordshire bull terriers .