To prevent distemper, viral hepatitis, respiratory disease caused by adenovirus type 2 and leptospirosis in canines. TRIPLE PET-GUARD® is developed for the application of primary vaccination schedules in puppies and revaccination in adult canines. It is produced with the Buzzell strain of canine distemper, the CAV2 strain of canine adenovirus type 2, selected for their highly immunogenic characteristics, and the six serovars of L.