The Transportation Safety Agency makes use of dogs to track down contraband, bombs and other stuff that we're better off never seeing onboard an airplane. It takes a pooch with a particular temperament to be trained for this sort of work. Not all dogs are well-suited for the job. Unfortunately, while you can make broad guesses, based on breed, on which dogs may be a good fit for identification or tracking work, there's no way to tell if an individual doggo will be any good at it until you put them to the task.