Your dog runs away with the leash dragging maybe because he has seen some game or had a fright. The dog would most probably return to its owner, tongue hanging in a few minutes but what if the leash gets caught on something like a root? Despite all efforts, the dog does not manage to free itself. Much worse, he could get tangled in the leash himself by his attempts to free himself and in the very worst case strangle himself. This dog is helplessly at the mercy of his situation and relies on us to find him quickly and free him from this predicament. Any owner would love to quickly look on mobile and see where his dog is and then save him.
This can not only save the dogs life but also the reduce our stress knowing that we always know where our dog is.