Every winter I will have a hen or two get a cold (?) They cough or 'bark' it really sounds like a little bark... I had one hen do this all summer too.. last winter I had 2 or 3 die.. the winter before.. the same thing.. they cough or bark for a couple of months and then croak. I always put meds in the drinking water and it never helps. this year I am using Vet-rx, nutri drench.. an electrolyte and 32% peroxide in their water and so far none have died. The little hen who barked all summer is still alive and another hen is barking. I had pneumonia or bad colds go through my flock 20 years ago and the peroxide got rid of it. I just can not get this out of them. any suggestions?