We have a flock of 29 (RIR and Buffs) that are housed in a storage shed with a large, fully enclosed yard. The door has a lock on it to keep chickens in and other things out. My daughter (13 years old) usually goes through in the mornings to take food and water. She and I were on our way in this afternoon and noticed five chickens running around outside of the coop. She apparently left it unlocked (which would have made the door crack open) and several escaped, but they were still hanging around. As we were pondering the situation, our border collie came charging through and chased one chicken to the doorway - we opened the door, the chicken hopped in and our dog went after the next group. He separated out one chicken at a time and managed to get three more inside the door. The last chicken was more troublesome and instead of going inside the chicken yard, she jumped the other way and ran through the woods. He charged after her and after a loud squawk, she went quiet. I managed to get to them (dense brush) and he was standing over her. She tried to jump and run and he grabbed her again. He would carry her around the neck area, but would eventually set her down and stand over her. He didn't try to hurt her, I don't think. I had a towel and managed to wrap it around her (he let me). We are new to chickens. None of ours have started laying eggs yet and they are about 18 weeks old. We have several large dog crates. We also have another storage shed that is designed to be used as our 'emergency room'. I took the crate in there, put hay in it, food and water and left her in there. She has one spot where it's obvious she lost a few feathers, but I don't see a speck of blood on her anywhere. She's walking and her wings look okay. The only thing is that she's walking around panting a bit (it looks like) with her beak parted open. I was able to pet her and although I haven't picked her back up, I can't find a hurt spot. I put a towel over part of the cage and turned off the lights. She's away from all other animals. Is there anything else I can do or something I should look for?