I have 8 hens, and one of them Toffee (unsure of age or breed guessing she is about 4) has been wheezing for a couple of weeks. I have treated all 8 with flubenvet 1% last week, but today she has been breathing really badly, neck stretched out, wheezing, coughing just gasping for air. I tried to look down her throat (for gapeworm) but couldnt she anything. Im starting to think it is respiratory her comb is flat and flopped, her tail is low and she is sleepy. However, when I had bread earlier she came alive for 5 minutes before flopping again. I have noticed one of the other hens is starting to show similar signs this evening. I have been searching internet for antibiotic and now I am all confused as to what I should do, should give her/them. Can anyone help please.