I'm about to get 6 chicks and this is my first experience. We are building a coop to keep them safe from dogs, hawks, and other hungry critters.
My husband is from Puerto Rico, and many of his relatives have chickens/roosters there. They all free range their chickens but put them in the coop at night. And you are right, there are a LOT of roaming dogs in Puerto Rico!
What breed of chicken are you looking into getting? Good luck!