Are you rural? I have a coop in rural Fl, the coop itself is airy with windows of doubled hardware cloth. The coop is inside a run of chain link. I used to have hardware cloth run with bird netting but it looked crappy . Standing up right is a plus ( In old coop I had a market umbrella with bird netting over it.) An electrified fence would be good too.
As for feed I use layer pellet but also feed any and all leftovers that dogs won't eat. My birds free range, they eat frogs, lizards, baby mice, grass, bugs, so yeah, I doubt my scraps will kill them Don't sweat it. Chickens have been domesticated for longer than dogs. They are adaptable and hardy. Chickens that get to forage will be healthier, though not safer. It is a toss up. My dogs protect Chickens.