I have 16 chicks, about 5 weeks old, different breeds. For about the past week most of them have been sneezing. They have no discharge, no watery or red eyes, no other symptoms at all. They are happy, eating, drinking, hopping around, growing like weeds. They have been inside my house on pine shavings, and I change the bedding one or two times a day. Minimal dust..... no ammonia. Pollen and allergens are terrible right now in my area.. I just moved them outside yesterday. Suggestions? Is this normal?