I have a 4-5 month old BR cockeral that has been sneezing since I got him (about a month ago). He doesn't have any discharge and hasn't had at any time, eating well (actually a little fat and eats like a pig), drinking, no running poop or any other symptoms I can see. The sneeze hasn't gotten worse and he isn't coughing, but he consistently sneezes every time he eats or drinks. He's been vaccinated for Merrik's and NewCastle's. Is there anything I can do to try to fix it, can chickens have allergies, should I be worried about this being some kind of infection? I've never had one do this and am not sure how to treat.