I am in the middle of building a coop and have some questions. I am considering whether it is better to put the pop door in the side or in the floor. I see that people have doors on theirs, but many designs that I have seen don't have any doors. If the coop is in a secured run, do you still need the door? If I have it in the floor and put a lip, will I still lose a lot of bedding? Thanks in advance for an opinions.