Blue Ribbon Dogs presents the APDT Rally Obedience Sign App. Add this app to your iphone in order to help when training for the Association of Pet Dog Trainers Sport of Rally Obedience. Levels 1 through 3 are covered. An area that lists all signs is also present. Each sign is provided along with an explanation of its principal part. Additional information is provided on each level. A handy search feature allows you to search signs by name or number within each level.