There are things you can do to help keep the predators out . Just know nothing is 100% successful. You can add electrical fencing, bury wire so they cannot dig under.
My girls are in the wooden part of the coop at night ladder raised and they are shut in. I take up their feed at night. My coop is moveable so I also keep it close to the house at night at away from our woods. Why attract danger.
My worst danger are the roaming cats. During the day I use a water gun to discourage their curiousity. The other day, I had a strange beagle trying to dig in with them that I ran off. My coop looks like an Iron Clad Warship and when I go anywhere I put the sides up. The girls have learned to go up the ladder too when danger approaches.
[/img]
I live on 4.73 acres of land but I can't free range my birds with all the day critters and have the night critters too. Only front acre is cleared because the rest is our wooded paintball park.
It is all down to risk management. I try my best to reduce the risk and go on faith for the rest.
My neighbor has a coop in a fenced run and her dog run goes all the way around it.
My other neighbor just has a simple wire fence and her coop is protected by her geese at night.
I have good latches on my coop. Once they are bigger - they can scare off the predators and things that would have eaten them as a chick.
My uncle had a little banty hen that ran off dogs, and once a wolf in Alaska. She even squawked at the occasional Eagle and ducked for cover. They had her for 10 or more years.
Good luck to you. Tell your son that the smell of bigger chickens might make him change his mind about keeping them in the house. My son (16) was thrilled to have his bathroom back as we evicted the chicks from the house to put them in their new coop last night!
Cal
Jax FL