I have a 2 month old buff orphington. I put her and her 7 other "siblings" outside 6 days ago. The other chicks are doing fine, however this one started to act lethargic 3 days ago. When i first noticed she was puffed up and not moving much i decided to keep an eye on her. The very next day I went out to the coop and she was just sitting all puffed up. I brought her inside and gave her some tetracycline(however its spelled). shes been a lot more active and follows me around and will fly to catch up with me if I get too far from her. She has very wattery poops with some thick green harder gooey poo in them. I have looked in the poo and not seen any blood or anything that would look like worms. Her stomach is also making some very loud gurgling. She does not have any discharge from her nose or eyes or any discoloration. she eats chicken starter feed and what ever crawls into the coop. Shes odly very content about being away from the other chickens and being around people. Just want to get an idea what experienced chicken owners think about what might be wrong.