I am converting a large dog house (one that was made for 2 black Labs to fit into at the same time) into a coop for my 4 silkie hens. The only problem I can see right now is that dog houses have no windows. Once I put a door on the front opening and close it up, it would be very dark in there. I am planning on adding vents near the roof. Does anyone have any suggestions on what kind of window I could use on a dog house?? I do need one right??? I can't imagine them being totally in the dark and liking it!! Thanks for the input.