First, we need to get everybody on the same page with terminology.
"Coop" and "Hen House" are the same thing. They are the structure that the chickens live in at night, lay eggs in during the day, and hang out in when the weather outside is too lousy. "Coop" is not the same as "run"...
"Run" is the term for the area outside the coop that is usually enclosed with some kind of fencing. The run is where they like to spend their days when the weather is nice. It may or may not have a cover, but some kind of cover (netting, wire, etc.) will make the chickens less susceptible to aerial attacks.
"Free ranging" is when the chickens are outside their "coop" and "run" and when they are most susceptible to all types of predators, especially dogs.
Okay, now we're all talking the same language here. Now everyone can lend advice and the OP will understand what they're trying to say.