We were going to put our chicken's in a chicken run that is concrete (floor). When my grandma lived at our house, she was a dog breeder and built this huge foundation for them that are split in 4 runs. So, we were going to put our chickens in them when they got a little bit bigger. But, expand the run so it's bigger. If we do put them in there, should we put something down? Do we have to? If so what?
I'm new at this, we just got some chickens about a month ago at our local country store.