No big horses before the 1800's
People should not run the horses hot and sweaty, then leave them.
Eight miles and hour is endurance speed
Eight miles the distance a buggy can go in a day
Horses are opinionated
People should not forget to lesson the saddle or take off when the horses stop
You can't Jump on totally unknown horses and then ride off on it
Horses need warm-ups
Horse bites do hurt
Muscling the horse aside is not possible. Horse push back.
Horse smarts depends on the horse
Harnesses are complicated, to put on and to train a horse too.
Harnesses must be sized to the horse. If it doesn't fit well, the horse will act up.
Different saddles will seat you differently.
Horse are not a TARDIS. They have maximum weight, and must be trained to carry stuff. Also, stuff must be carefully balanced on the horse.
The bigger the horse the less stamina it has
Mules are stronger then a horse and smarter, more endurance, and less delicate. They don't need protein, and survive on less. They are stubborn and have long memories.
Horses can be very stubborn
Older/more experienced horses that have been the rider will be more likely to do new things with these riders. Young horses are less likely.
Pay attention to the gender of the horse
Mares go into heat during the summer. Mare behaviors can change drastically. Stallions are easily distracted by mares. Stallions will compete for the mares with each other.
Stallions and geldings will get along.
Breed mares will not go into heat, but may act like their in heat.
Wild horses will act differently from domesticated horses
There is only a window of time for a domesticated horse to adopt a foal, but in a wild herd, parentage is less of an issue.
Body Language – face horse to aggression, turn shoulder to stop
Stallions want to herd others
Do not chase the horse, bribe the horse, and be friendly to the other horses to catch a horse.