One of our mares does this:
I can say she's the only horse I would trust to do this. She is very affectionate and is not a biter. I'm pretty sure it's just because your skin is salty, but mine will randomly lick me when I am grooming her or giving her attention. Probably a mutual-scratch kind of thing.. without the "scratch".
That being said, we've owned this mare for many, many years. She is very, very gentle and broke and respectful. I definitely do NOT let the yearling do this, or any other horse for that matter. XD
My moms gelding licks hands. He likes the salty taste.
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