I started my first ever flock April 2, I got 4 from a flea market (now I know that's the wrong thing to do) and 4 from a friend. Daisy, a little 3-4 month old buff orpington passed away last night. She slept a lot yesterday and had been sleeping in a box instead of on the roost with the others, but since I don't know chickens I didn't know that was a bad thing, now I'm thinking maybe she's been sick a few days. She may have been breathing hard, I'm not sure how chickens are supposed to breath. My question - is there something I should get to give the others to hopefully prevent them from getting sick? Thanks for the help, love this group!!!!