I need some information about raising chickens. I live in the western part of Kentucky,where the temperatures might get to the low- teens. Do I need to insulate the coop? How big should I make the coop and pen for 6 heavy breed chickens. Will a Great Pyrenees dog guard chickens or will I just have trouble with the dog eating them? What is the best brown egg layer? Will the hens need a rooster in order to lay eggs?