My in-laws gave us one for our dogs - who hated it. We had it under our deck unused for months so when I got the chooks, they took it over. I put some pine shavings in it so its nice and cozy and it is a dry place for them to hang out in wet weather. The design of it means it is pretty cozy in there too as their combined body heat warms the area up for them. The issue I would have with using it as a coop (and trust me, it has occurred to me) is making a predator-proof door for it. On mine at least, the whole thing is made of, I guess, plastic, including the doorway. It would be difficult to design a door to attach to the opening, that would be halfway secure. There is also nowhere to attach roost supports but that difficulty can be overcome by having a free standing roost that sits inside the igloo.