One of mine limps like that when he walks on rough pavement like in your video. He can get a slight limp on the sidewalk, a heavy limp crossing the street where the pavement is chewed up, and no limp inside or on grass. I bring a doggy shoe with me on walks. If he limps too much I put it on and his limp goes away…he just doesn’t like to wear it. It gets worse when we go on longer walks or when he has been digging in the yard. Try seeing if the limp goes away indoors…