I have just recently had a sick chicken that died. and now I have another. He lives by his self and has for a long time. but this morning I found him to have a noise wheeze and when he crows it dont sound very good. He has runny poop that is kind of green. Is there any kind of vitamin or medicine that I can give him? He is probable about 8 pounds and almost a year old. I know that sometimes they just git sick and die but he is a pet and would like to help him if I could. He is eating and drinking and still active. The other chicken I never knew until it was to late she gust got to were she was wanting to be by her self and then didnt want to move a lot and didnt eat then died, I just hope that it wont happen to him. If any one can help please do.