Hi there, I have a brand new Black Copper Marans pullet I got from a very good local breeder yesterday-- however, she has a bit of a runny nose and sounds a touch croupy (I thought I'd inspected her well before taking her, but apparently not). Other than that she's active, eating, drinking, and well. I've contacted the breeder and am waiting to hear back; I've also separated her from the rest of my chickens (they weren't in together yet anyhow, though she was in with the Ameracauna I got from the same breeder). Is there anything I can do for her? My easiest options are: -I've got quite a bit of Doxycycline from my various foster dogs/former foster dogs with heartworms (not taking it away from a current dog, I promise!). -The breeder advised Tylon 50, which I'm sure I can go purchase at the local feed store. -Another chicken friend has some probiotics from the vet she can give me. Which of these is the best option? I'm fairly newish to chickens, so forgive me-- I see LOTS of "sickness" themed posts here, but I'm a bit overwhelmed by the amount of information!