A week or so back all the chicks in my brooder caught a "cold". Everyone was sneezing and dripping and gross. Since then they've been on tetracycline, and the worst seems to be over. A few sneezes here and there, but not much. Except for one chick. She's my dark brahma of the group, and she's just not getting better. She has to breathe through her mouth and is wheezing and huffing and puffing. She seems fine with everything else, she runs across the brooder to chase the others, cleans herself, poops normally. She just has a hard time breathing. Should I keep up with the tetracycline and see if that eventually helps her or should I try something stronger on her?