I had woken up to 3 chickens in my garage so I have no prep for their sleeping and housing. Right now they have settled in the backyard under some materials that act like shade. The entire backyard is gravel with some grass here and there but I want to have a secure area for them before the sun sets. I have a few choices as a temp; an old dog kennel (5x5x5 and I could put a tarp above) or an old guinea pig hutch (3x5 and has wire under and is raised). It is only temp, until I can go to town and get supplies to build a proper coop. The chickens are quite small, like just a little over 5 inches from head to tail. I dont know if thats small but I had another stray chicken once that was huge like almost a foot from head to tail but she got into an accident with the terriers :'(. And they will only be in these houseing overnight, as soon as I wake up (8 am) they will be roaming free. Thanks for the help!