I am a new chicken farmer that really does not know much yet. I had 8 four week old chickens in a large chicken tractor type coop and when I got home this morning I found the door open and all of them gone. The wire holding the door to the outside coop closed was broken, and the door partially open. We have a dog tha has been very interested in them, but I cant see her killing all 8 and leaving no signs. How far will chickens run if they get out? Is there any chance any may have survived? I have looked all over our three acre place and roamed parts of the neighboring land and see no signs of feathers or anything. My three your old is going to be heartbroken!