The search dog follows the trail. Whose trajectory is it repeating?

Since the “bloodhound” follows the trail of, say, a lost person, it repeats the trajectory of this lost person, because the trail is the trajectory.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.