I have a beautiful Light Sussex pullet, about 8 months old. She has been sneezing constantly for a couple weeks now. I did the antibiotics in the water for a whole week, then I switched to 1cc Tylan 50 (orally) for a 3 days right after that, and nothing is making her stop! She's not acting sickly or lethargic, still laying, eating well, drinking well, I'm baffled. She doesn't have a leaky nose, and her breathing isn't wheezy. Just constant sneezing! Any thoughts? Should I go back to the Tylan, and give her a higher dose? or for a longer period? She's a VERY large bird, compared to my other layers. Probably on the scale of Brahmas.