Boys will be boys

Visualize the boys. What they are wearing. Their weight. Their height. Hair colour. Are their faces well-rounded, well-fed or gaunt and malnourished? Do they have big hands or bony hands? How dirty are they? What about the time of day? Describe the location. How big is the rock. How are the knots tied. Are they good strong knots or just barely holding on against the struggling? And their homes. Big or small? City or town? A farm maybe. What their parents are like. What their teachers are like. Good students or underachievers? Do they stand out? Are they mundane? Are they typical? How often have they done this before? How often will they do this again? Is it fun? Think about the expressions on their faces and the taste in their mouths. Is it fun?

I could do all this for you, write a few lines of imagined dialogue or something but then I might take it too far or not far enough. So you can do it for yourselves and take it as far as you need.

Think about what the boys are saying to each other as they are hammering.

But, whatever you do, don't think about what the dog is going through. If you think about the dog too much, you might lose it.