Hi! I was wondering if anyone ever put a dog/cat door on the coop? This winter I want them to be able to go in and out of the coop, but I wanted to try and keep the warm air in the coop as much as possible and the open chicken door may cause an awful draft. Do you think they would be scared of it and not use it? They are all standards and I know they can squeeze/push though things when they want to. Anyone tried it?