I always keep a close eye on the horses, especially during the winter when their thick coat can hide weight loss and rain and snow make even the toughest animals shiver. Thankfully, there is one good indicator that they're doing well: snowy backs.
Nothing bothers Dancer when sweet feed is within her grasp.
If there's snowfall and the snow settles on their backs without melting, it's a good chance that their body heat is being kept in by their fluffy hair and they are healthy. If it melts, something's amiss.