A stray dog attacked our chicks yesterday - luckily all were OK - except for one. She had no puncture marks just lost a lot of her feathers and was in a light shock. I brang her inside and kept her in the warm air, feeding her some warm porridge. This morning she was chipper but I noticed that her flesh around her lower back was swollen and upon touching I realised that it was almost as though it was blown up like a balloon. Upon checking her again 3 hours later this has now spread and her entire body is now puffy. It is not fluid that I can see but more like air.. She is eating and drinking just fine but is not her usually self in that she is not running around with the others. She is quite and slow.... What is causing this ballooning effect? Is it just natural trauma that will right itself or is it something more serious?