I was feeding my chickens and the pigeons were flying around and all the sudden our dog barked and rushed towards a flailing mass on the ground. At first I thought that a chicken had been caught by a hawk, but it was just one of the pigeons. I put her in a cage with food and water, but she's just sitting in a corner, shivering. Is this from shock, or does she have something wrong with her? When the chickens are in pain they leave their mouths hanging open, is it the same for pigeons?