Horse first heavy sweatnow electrolyte paste syringe horse first heavy sweat now can be given before or immediately after exercise directly into the mouth when a horse works or exercises it sweats this is a horses natural cooling down mechanism a horse sweats even more when it is not fully conditioned or fit in hot or humid weather or when its nervous excited or agitated a horse can lose 15 litres of sweat in one hour in hot humid conditions the type and duration of exercise wi