I am really worried about my baby Pekin duck, Emerson. He is 5 days old and has been growing and progressing normally, but today he is acting a little lethargic as well as having runny poop, a very slightly runny nose (very clear fluid) and occasionally pants like he is struggling to breathe. Is there some kind of medication I can give him? Can you give Tylan to ducklings? I would appreciate any advice.