I don't know about you but I love learning little tricks about horse health or horses in general.
Share your tips here and also if they have worked for you.
Here is the most recent one I heard:
If the tips of a horse's ears are warm it is not badly sick.
(This worked well the other day for a horse at my barn, the owners were trying to see if she had colic, the tips of her ears were warm and it turned out she just had a belly ache for a few hours)