Wet bran MASH works pretty good to clean a horse's gastrointestinal tract out. Actually, any source of fiber should work, but bran is easy to get in quantities sufficient to affect a horse.
In addition to the above answer, it has been found just recently that bran mashes actually have no laxative effect to them at all. They do not provide enough fiber in the amounts that they are fed to clean out the digestive tract in any way, and they can cause a calcium to phosphorus imbalance if fed often. It is best to provide lots of hay and fresh clean water. if the horse seems constipated it would be best to call a equine vet.
Horses do not like to eat leeks
Probable because they absorb water and as a consequence the pressure in the bowel is increasing.
Food
Food.
You shouldn't give them food like mash
Docusate sodium, also known as Colace, acts by a detergent-like effect to soften the stool by helping water and fats penetrate into the stool, making it easier to pass.
yes they need food!They are living things just like you and me.
horse food like chaff
They graze like all other horses.
Horses have lungs and nostrils just like us humans to obtain oxygen. They also have stomachs like us to digest food. Humans and horses are both mammals and vertebrates so we're relatively the same
Their mouths, just like they do today.
food