Hello and welcome to BYC! Glad you joined.
Sorry about your puppy chickencide.
If your hens and rooster and truly hens and a rooster, they could very well be moulting. It is that time of year if you are in the northern hemisphere.
If you could update your profile to give a general idea of where in the world you are, maybe some specific answers could be given to your question. I know my flock is looking a little shabby right now as molting has begun.