That read my mind!My chickens sneeze a lot too, even when they are outside. They have no other symptoms--no runny/crusty noses or eyes, no coughing, no lethargy, no weird poops. It worries me, too, but it's been all summer and they've shown absolutely no other signs of ill health, so... If mine were to show other signs of respiratory infection...I think I would cull. I don't want to mess around with contagious illnesses.