close-up of a cheerful bullmastiff running on a grassy lawn with dirt being kicked up in the air

bullmastiff dog grass run dirt fly happy lawn cheerful canine joy uncontained sprint active gleeful exuberant bounding exultant playful elated vigorous energized enthusiastic spirited jubilant carefree joyous thrilled buoyant lively ecstatic exulting gleaming vivacious jumping bubbly