Hello I have one hen that keeps sneezing it was very infrequent at first but today when I was out there she did it several times so I took out their nipple waterer and mixed up a Gallon of oxytetracycline (2-1/2 Tbs. Per gallon) in a one gallon bucket and made that their only water available. Could be allergies? I just treated them for suspected mites with pour on ivermectin and dusting with permethrin as well as spraying thr coop with the liquid version of seven dust about 4 days ago. Could this have anything to follow with it? She was sneezing befor but now she's sneezing and sounds raspy when breathing. What else should I be doing?