Extra food for energy.
horses walk,trot,canter and gallop.
Frequently exercised horses need extra minerals and grain.
calories and salt
Salt
horses that are frequently exercised need feed with higher fiber and less suger,
they need lots jumps and they need lots of troting polls
if they are walking on a rough terrain then they will need horseshoes. these can be put on by a farrier.
Oats and grains are high energy foods, great for horses that get frequent exercize.
increased fat
on howrse the answer is increased protein and carb.
No, they do not use them.
Horses are herd (groups) animals, and as such need the company of other horses or animals. Race horses frequently have "pets" that travel with them that give them the socialization and company they need. Goats and cats are popular choices.