If your horse is shod then you should have the farrier visit every 6 to 8 weeks to trim the hoof and reset the shoes. You should have new shoes put on the horse as old ones can be a bit deformed or worn thin, but it is a good idea to carry a few old ones around with you for emergency spares if your at a show or on the trail etc.
DailyDaily
Daily you should always clean your horses stall at least once a day
A horses stall should be cleaned every day if possible but if not every other day.
when ever your horse gets its feet trimed reguarly. It depends on how fast their feet grow. Its best to ask your farrier.
a stall?? Once daily...
How often should you change the fuel filter?
A horses stall should be cleaned every day.
you should really clean your horses stall from 3-6 days of the week.
You should remove all the droppings and obviously wet bedding twice every day, and completely change the bedding at least once a week.
every week or every other week
as often as needed
No. Protein cannot change a horses' color. Horses often change color but age is the main factor. Most young horses change color as they mature. Sometimes the change is minor. For example, a colt or filly being born a plain brown but maturing into a bay with the black stockings becoming more apparent with age. Sometimes the change can be drastic. For instance, a horse born jet black may mature into a grey, a dappled grey, or "flea-bitten grey", which can be almost totally white :-)