If it is very secure, I guess it is fine. But, the chickens just seeing any predator can freak them out. Read my article: “Why you NEED a sturdy, ventilated chicken coop” for more information.
You should also add a automatic closing door or a manual closing door to keep the chickens locked up in the coop at night. Read my article: “Why you NEED a sturdy, ventilated chicken coop” for more information.