P218CEEFAX 218 Wed 19 Oct 12:02/42    E    IRELAND Electronic devices are to be implanted under the skin of guard dogs after a pack of alsations mauled two Dublin schoolboys. They@will jnable police and dog wardens to keep track of the dogs.  ARGENTINA President Alfonsin has announced that presidential elections are to takj place@on May 14 next year, the first time an elected Argentine leader has called elections since 1951.  PACIFIC The USA has turned down an invitation by Tonga to take part in a joint defence exercise because New Zealand forces will be participating. News index 1p2/2p2 Newsreel 119/219 Newsreel NewsIndex Newsreel Top Sport