It’s so hard to look at a minute or so of a video to determine what is exactly happening an to then try to give advice or evaluate based on that. Remember, I’m out in the field daily with my dogs living with them every single step of their lives. When sled dogs especially get excited either when they are stopped on a sled and want to go or are mushing and want to go faster or in a different direction they will start jumping, bouncing, twisting almost any erratic movement they can make as they want to go and go as fast as possible! So if sometimes the dog looks a little eratic or the gait seems awkward that’s not necessarily a result of the harness but more of the situation.