I have a nearly 1 year old Speckled Sussex who's been making a peeping / squeaking noise for about a week now. She sounds sort of like a squeak toy refilling with air. She's been laying, eating, drinking, playing, etc. just fine. My other 3 gals sound totally normal. Yesterday my Aunt suggested a Sulmet liquid since it seems like it's something respiratory but, I couldn't find Sulmet at our TSC and gave her Corid instead after reading a few posts on here.... I gave her a syringe full yesterday (she wasn't too happy about it), and seems to sound the same today....any idea how long to treat / how soon I'll see results? Any other ideas of what it may be?