I have three pullets around 5 months in a backyard coop (2 Australorps and 1 Dominique), with a large run that is always dry (as it has a roof). Coop is cleaned out regularly. All of the girls are extremely perky, talkative, and growing. I have never noticed ANY signs of sickness with any of them, except for tonight I noticed Scarlett (one of the Australorps) had a hoarse voice-- Midnight, her Australorp sister has recently started sounding like a real hen (bawking away) instead of the chick-pullet chirps, and just yesterday Scarlett started to bawk as well-- do you think her voice is strained or she's coming down with something??