I have noticed my chickens coughing - 9 girls, about 4 or 5 coughs in about a half hour. I don't notice anything terribly amiss - they are not lethargic, their eyes seem bright and I don't notice any nasal discharge. I am mostly concerned because I have to be away for 10 days later this week. They are all about 9 months old, except 1 who is 1 year and 9 months. They have been together for 6 months. I did notice they had some green algae in their water, and I cleaned out their heated waterer, and will put in ACV. I thought I might also give them yogurt. The weather has been up and down warmish and cold, rain and snow, and the coop was pretty messy, (cleaned it yesterday) as is the ground, which currently has about 6 " of snow. The only other unusual thing I can think of is that they won't walk in the snow, and so I put down straw from a condensed bale of straw for them to walk on...no, not spoiled at all. Any suggestions or should I try to get to a vet before I leave? Any help appreciated! Thanks!