I have a 6 month old silkie who is wheezing with every breath and what sounds like a squeak when she coughs. I have tylan 50 injectible, I plan to give her that. Am I right to give her Tylan? She is the only one in my flock with this problem, and I just noticed it today. I have her inside (she's wearing a diaper) and she is acting fine other than the wheeze. Could she have just caught a bug or should I be more concerned?