Most mammals sweat to allow evaporative heat loss.
Horses are extra special!!
When horses sweat you can often see a lather or foamy consistency to it. This is due to a product called ‘LATHERIN’ which horses produce unlike humans (thank heavens!!).
The latherin reduces the surface tension of the water in the sweat and assists the moisture in moving away from the skin to the surface of the horses coat. This improves evaporation and cooling. This is extremely important in horses as they need to lose a large amount of heat which is produced during exercise from their large muscles.