Chalk Line Patrol

Morning call! I scooped up my shiny red whistle and trotted right out under the door gap! Out on the sidewalk slab, someone left a chunky piece of yellow sidewalk chalk sitting in a crack. I gripped the chalk with both hands, planted my feet wide, and dragged it right across the rough concrete! Scritch-scratch! A bright yellow border line appeared right along the edge of the lawn. Perfect boundary marker! I hopped over the fresh stripe, let out a cheerful yip, and tapped the yellow line with my shoe. Official sidewalk sector is clear and marked!