Hi Eylin,
That’s a great question! You definitely need to have some balance in there – time for her to sniff and enjoy herself and be “off” and time for her to learn not to drag your arm off. But always be ready to jump back into training mode if, say, she tries to eat something on the ground you don’t want her to (“Leave-it!” practice) or tries to drag you full speed to something she wants to sniff (reinforce that you will only move forward if the leash stays loose and, so long as it does, walk her over to what she was interested in checking out).
Darcie