Hi all. I have a droopy gander, he's about 9 months old. He's not hanging with the rest of my flock, he's eating a little, he seems to be very thirsty, and he kind of squints his eyes 1/4 of the way shut. No discharge from his nostrils, no signs of respiratory distress and his poop looks normal. I've been treating him with Tetroxy HCA-280 antibiotic for the last 3 days and no improvement. I would appreciate any suggestions?