If you witness your horse coughing repeatedly in her pasture you can record what is happening with a camera or phone and send it to your equine vet. The vet can then come out and examine the horse and determine what is causing it. Likely it is mold or pollen, but it could be other issues and the way you keep or manage your horse will have to be changed.
It doesn't really matter, but I find inward to the pasture is easier as you dont have to back out of the way as it swings open.
A horse pasture should have enough space to graze as well as space to run. One horse is 1.5 AUs, so depending on your locality, pasture quality, time of year, etc., you could pasture one horse per 2 acres or more per month.
Hackney
In a stable in the countryside?
the black thouroughbred in my pasture
A horse in a good pasture will do.
This is the way horses are: your horse is the "new kid", the lowest in the pasture's pecking order. The gender make up of the pasture has an effect too, as does the gender of your horse; but they will all eventually work it out, it's a natural part of their world and they know how to handle it.
This can depend on the breed of horse and type of work the horse is being used for. Example, is the horse kept for training and competition or is the horse for hacking/riding for pleasure. Stable vs pasture can also depend on the time of year -winter vs summer and of course the quality of the pasture- is there shelter and food.
Yes and no. Yes for if it cribs alot and if its in a small pasture. No for if its in a big pasture and if it doesn't crib alot.
Yes
It can help so long as the horse doesn't have what's called 'pasture heaves' where it's allergic to the molds in the grass.
No. Pasture the horse on untreated grass. No treatment of any kind, except cutting the grass with a lawn mower.