All of my horses love to lick us. My 20 y.o. Clyde X does this the most, and always has. After a treat, the horses will often lick our hands to get any last bits of crumbs (if we let them), but Sam licks everything, treat or no treat. He will lick my coat, my jeans, my hat, my gloves... He tries to lick the farrier's back when he's getting his feet done. The others lick too, but not to the same extent. They also never offer to nip or bite, but just like to lick in a lazy and relaxed manner. Our horses are all well fed with quality hay, concentrates and mineral supplements. Anyone else have "lickers"? Why do they do this?