what can cause loose stool in horses
However loose stools in a horse can also be caused by factors other than anxiety or stress: 1  The horse or pony could have eaten a poisonous plant. 2  There are common trees and plants that are poisonous to horses. 3  Some of these are only mildly poisonous-but others can be fatal.
1 Giving your horse too many treats such as apples can also cause loose stools. 2  Loose stools can also be a symptom of sand colic. 3  A diet too rich or high in protein can also be a cause of 'squittery' droppings.