Not only the underlings that get chased around and not let into shelter suffer.
The boss also is stressed, needing to pay attention to keep everyone in line.
All of them can use a time out alone to chill and relax for part of the day.
We had one young mare that never had any health problems.
When bred and kept with the broodmares, she took it on herself to be everyone’s guardian, watched always when others took naps, cared that foals were ok.
Nothing escaped her, the wind wiggling a weed got her hyper alert attention, she never relaxed her self appointed watch pot task.
She was not the boss, just the alerter to any and all.
Then she started having allergies, would scratch herself raw, her mane and tail practically gone from itching and scratching, no matter what we did.
Then she hurt her foot and needed to be kept in the barn and what do you know, her allergies went away.
Same place, same bugs, same pollens, same food, all the same.
Her stress level in the herd seemed to be the trigger for her allergies.
Each horse is an individual and should be managed as the individual it is.