During the scours, you want to ensure that the foal is drinking plenty of fluids and does not become depressed. Whenever these signs are seen direct involvement of your veterinarian is needed. A course of antibiotics along with probiotics for the bowel may be prescribed. Anti-inflammatory medications may also be given. Foal scours usually are just part of your young horses life, but don't ignore your foal if they try to tell you they don't feel good.
Chances are, if they look sick, they are.
My horse sweats a lot during training. I'm worried he will dehydrate. I've heard I should be adding salt to his feed. It is a common way for many animals to cool themselves. The horse generates a tremendous amount of heat when working.