How to balance training and exercise during a walk? [closed]

Ideally, the dogs should get energy out before the walks, but if you are hired for just dog walking... It would probably be asking too much for you to also play with them or take them on a run. But if you do have time, maybe you could play fetch or other games.

Your concerns are valid; you don't want to constrain them too much, but you don't want them to get away with bad behavior. I would try to compromise as best as I could, by walking quickly, at least at first, but expecting them to walk on a loose leash. You may want to wrap the leash around the dog's chest (as well as being attached to the collar) to reduce pulling.