I'm brand new to chickens, but me and my spouse are getting serious about having a few hens in our backyard. Right now I'm looking into getting a chicken tractor from someone in the neighborhood who builds them, and then I guess it's a matter of finding 3-4 laying hens. (I guess I'd like to start with grown chickens rather than raising them from little babies, at least for my first ones.) I've got a large backyard with a waist-high fence, so I'm imagining letting them roam around most days. Possibly with wings clipped, as the neighbor next to us has a dog. My neighborhood definitely has wildlife, including foxes and raccoons. How necessary is it to be at home to shut the coop at sunset? Can this be fudged a little, or do I want to get an automatic door for the henhouse ASAP?