Let’s go u-turn
With you and your pup facing the same way, hold a treat and lure them around you to face in the opposite direction. Say “Let’s go” and immediately give them treat when you are both facing in the opposite direction to the one you started. Take a further two steps and then give a second treat. Once you have practised as directed above, you can start to only give a treat once, when you have turned plus taken two steps (i.e., removal of the first treat). With practice, your dog will begin to anticipate that “Let’s go” means turn in the opposite direction and you can use the cue rather than the lure.