Here is a concise description of the video: A white bull terrier with a black collar is excitedly running around on a grassy lawn in a backyard. The dog is leashed, though the leash is dragging behind it. A person in a dark coat and blue jeans is standing nearby, partially visible on the right side of the frame. The backyard is enclosed by a brick fence. The lighting suggests it is either dusk or dawn. Trees are visible in the background.