What a cutie, how do you manage to keep your chicken's white feathers so clean???!!
I sometimes wonder myself. They love digging through the horse stalls and picking through fresh horse poop

But I also have lots of wood shavings so that likely helps, and naturally sandy soil here.
I have found that dry sand and shavings are the best for horses and chooks.
Don’t get me started on pine sap though - ugh! It sticks to everything and is miserable to pick from horses manes and chickens feathers. Oh and human’s hair!